matplotlib-users Mailing List for matplotlib (Page 2)

John Hunter wrote:

>>>>>>"Dominique" == Dominique Orban <Dom...@po...> writes:
> 
> 
>     Dominique> Regarding my previous message on TeX labels, it would
>     Dominique> seem that having parentheses in there mix up the
>     Dominique> alignment. Not "regular" text, as i previously
>     Dominique> suggested.

Your trick did it just fine. TeX titles and y-labels appear correctly 
now. Vertical y-labels are not an issue for me right now. Perhaps other 
users?

>     Dominique> A final comment, using gca().set_yticks( ... ) prints a
>     Dominique> large number of messages "<matplotlib.axis.YTick
>     Dominique> instance at ...>". There must be a print somethere.
> 
> You're in interactive mode right?  In a python shell
> 
> 
>>>>2+2
> 
> 4
> 
>>>>x = 2+2
>>>>
> 
> 
> 
> Ie, an expression which is not assigned to a name is printed in the
> shell in interactive mode.  set_ticks returns a list of tick labels to
> allow you to do things like
> 
>   labels = gca().set_yticks(['a', 'b', 'c'])
>   set(labels, 'color', 'r')
> 
> The point is, if you assign the return value of set_ticks a name, it
> should no longer print to the shell.  Ditto for other plot functions
> that return a value.  If this doesn't cure you, let me know.  A
> residual print is always a possibility.

Well i agree with the above, but i wasn't in interactive mode. Moreover, 
gca().set_xticks doesn't print anything. Here is an example:

 >>> import matplotlib
 >>> matplotlib.use( 'TkAgg' )
 >>> from matplotlib.matlab import *
 >>> x = [1,2,3,4]
 >>> y = [2,1,4,3]
 >>> plot(x,y)
[<matplotlib.lines.Line2D instance at 0x01092B20>]
 >>> show()
 >>> gca().set_xticks( [1,2,3,4] )
 >>> show()
 >>> gca().set_yticks( [1,2,3,4] )
[<matplotlib.axis.YTick instance at 0x010738A0>, <matplotlib.axis.YTick 
instance at 0x010793F0>, <matplotlib.axis.YTick instance at 0x01079F08>, 
<matplotlib.axis.YTick instance at 0x01076A58>]
 >>> show()

The two set_[xy]ticks commands work fine. For some reason though, 
set_yticks outputs tick instances in the terminal.

Cheers,
Dominique

>>>>> "Sajec," == Sajec, Mike TQO <ms...@tq...> writes:

  Mike> Hello, Is it possible to change the angle at which tick
  Mike> labels are displayed?  I'm trying to avoid overlapping
  Mike> labels when the labels are somewhat long.

Hi Mike, take a look at the FAQ "How do I make vertical xticklabels?"

 http://matplotlib.sourceforge.net/faq.html#ROTATETICKS

and the general tutorial on working with text
http://matplotlib.sourceforge.net/tutorial.html#text which shows how
to set text properties.  One of the properties is rotation, which can
be applied to any text instance (title, ticklabel, xlabel, etc.)

Rotation can be 'horizontal', 'vertical' or an angle in degrees.  Not
all backends support the latter, but the *Agg backends should and it
would not be too much work to add this to PS and GD.  Let me know if
you need it.

Safest for you if you need this across backends would be 'vertical'.

JDH

First, let me say, I don't know if there is code to do exactly what you want but here are my thoughts.
It sounds to me like you're asking for Lagrange polynomial fitting routines. Googling for "lagrange polynomial python" does return some code here: <http://www.stanford.edu/~sturdza/akimamod/akimamod.py>
Another possibility is the spline fitting routines in Scipy (scipy.interpolate). These may be appropriate if what you're really after is just a way to fit smooth functions through points. I've used the splrep and splev functions there successfully to fit spline functions through points. When I was looking for curve fitting routines recently, I also came across some more generalized curve fitting modules for Python but I can't recall where :-( I think they were SWIG wrappers for a C library.
Also, look at this:
<http://www.scipy.org/site_content/remap?rmurl=http%3A//www.scipy.net/pipermail/scipy-user/2003-August/001864.html>
HTH,
regards,
Gary

----- Original Message -----
From: Jean-Baptiste Cazier <Jea...@de...>
Date: Fri, 19 Mar 2004 11:49:21 +0000
To: "Gary Ruben" <ga...@em...>, jdh...@ni...
Subject: Re: [Matplotlib-users] Polyfit

> 
> Thanks to both of you. It worked just fine
> 
> I will push my luck and ask if any of you knows of a module to fit a piecewise polynomial to a list of (X,Y) points.
> something like 
> p=piece-wiseFit([1,2,5,7,8],[3,4,2,5,5],2) 
> would return [[A0,B0,C0],[A1,B1,C1}[A2,B2,C2},[A3,B3,C3]}, coefficients for the 4 polynoms 
> A0+B0.X+C0.X.X
> A1+B1.X+C1.X.X
> A2+B2.X+C2.X.X
> A3+B2.X+C3.X.X
> 
> This is a classic and I expect the code to be written somewhere, eventhough I could not find it even when I "Feel lucky" with Google.
<snip>
-- 
___________________________________________________________
Sign-up for Ads Free at Mail.com
http://promo.mail.com/adsfreejump.htm

>>>>> "Jeremy" == Jeremy O'Donoghue <je...@o-...> writes:

Hi Jeremy!

    Jeremy> Hi John, I'm (slowly) getting around to doing all of the
    Jeremy> things needed to bring backend_wx up to date (as far as
    Jeremy> possible). backend_wxagg will arrive, but I'm trying to
    Jeremy> get some other things into backend_wx first, specifically:

Good idea to port the stuff to backend_wx first ....

    Jeremy> - Support for images (which is turning out to be trickier
    Jeremy> than I thought) - Support for the object picker (which
    Jeremy> should be easy) - Support Mathtext

    Jeremy> The problem of Mathtext support is a superset of the image
    Jeremy> support problem.

    Jeremy> The approach which I'm looking at is to use wxImage, which
    Jeremy> has a fast method for loading data (wxImage.SetData()) -
    Jeremy> ths expects a C string of length width*height*3 (in format
    Jeremy> RGBRGBRGB...).


    Jeremy> Not sure what format im.as_str() returns as I can't find
    Jeremy> any documentation (the im parameter to
    Jeremy> RendererWx.draw_image() is an instance of
    Jeremy> matplotlib.image, I assume), so I'm stuck (or was a couple
    Jeremy> of nights ago).

Thanks for letting me know about the doc problem.  I updated the doc
string with "The string is a numrows by numcols x 4 (RGBA) unsigned
char buffer".  The best place to look in the code for guidance is
backend_gtk

    rows, cols, s = im.as_str()
    X = fromstring(s, UInt8)
    X.shape = cols, rows, 4

You'll want to lose the alpha channel presumably, unless wx supports
it, something like

    RGB = X[:,:,:3]
    s = RGB.tostring()  # to pass into the wx draw_rgb_from_buffer

I can also provide an as RGB method in the image module if you want -
see if the above works and if you are happy with the performance.  If
not, let me know.

mathtext, while closely related, is a little more difficult.  The
image returned by as_str is an MxN array of alpha values (no color
information).  See backend_gtk again for guidance.  In the example
from backend_gtk below, rgb is an rgb tuple and pbpix is an MxNx4 RGB
array.

        pbpix[:,:,0]=int(rgb[0]*255)
        pbpix[:,:,1]=int(rgb[1]*255)
        pbpix[:,:,2]=int(rgb[2]*255)
        pbpix[:,:,3]=Xs

So each of the color elements in the RGBA array is constant and only
the alpha value is varied with the return value of font as_str.  If wx
has no alpha channel, you'll have to do the blending yourself.  If
there is get_image_rect, you can get the background image background
and manually blend the pixels.  This is what I was doing in
backend_gtk before Trevor Blackwell showed me how to use the dark,
undocumented RGBA from numeric array support in pygtk.  [If you just
ignore alpha, eg, and just set RGB anywhere alpha>0, it will look like
crap; I tried].  But if you can efficiently get the background image
into a Numeric array, you can do the blending yourself w/o too much
work.  Easiest would be if wx supports rgba.

    Jeremy> As you say, writing wxAgg is really pretty
    Jeremy> straightforward, and it's on my (ever lengthening) ToDo
    Jeremy> list... At the moment I don't have anything in a usable
    Jeremy> state.

When you get the image_as_rgb thing working, we could do a wxagg dry
run by having backend agg provide image_as_rgb_str.  My experience
with GTK and image support is that this is surprisingly fast, and has
acceptable interactive refresh rates while resizing etc.  It shouldn't
be the final solution for efficiency sake, but should be trivial to
implement and wouldn't require any additional extension code.

Basically you just remove the renderer and the GC and forward all the
calls in the figure canvas to renderer agg, and then you could use the
currently nonexistent agg.image_to_rgb_str to render the image to the
wx canvas.

Down the road if you want to blit from extension code, you could do

class FigureCanvasWxAgg(FigureCanvasWX):

    def draw(self):
        """
        Draw to the Agg backend and then copy the image to the
        wx canvas

        """
        agg = self.switch_backends(FigureCanvasAgg)
        agg.draw()

        try: import _wxagg
        except ImportError:
            w, h, s = agg.renderer.image_as_rgb_str()
            wx.draw_rgb(s) 
        else:       
            _wxagg.blit(something, agg.something)

which would be nice because it would support users who couldn't
compile the additional extension code.  I should look into doing
something similar in GTKAgg :-)

JDH

Thanks to both of you. It worked just fine

I will push my luck and ask if any of you knows of a module to fit a piecew=
ise polynomial to a list of (X,Y) points.
something like=20
p=3Dpiece-wiseFit([1,2,5,7,8],[3,4,2,5,5],2)=20
would return [[A0,B0,C0],[A1,B1,C1}[A2,B2,C2},[A3,B3,C3]}, coefficients for=
 the 4 polynoms=20
A0+B0.X+C0.X.X
A1+B1.X+C1.X.X
A2+B2.X+C2.X.X
A3+B2.X+C3.X.X

This is a classic and I expect the code to be written somewhere, eventhough=
 I could not find it even when I "Feel lucky" with Google.


Takk

Kve=F0ja

Jean-Baptiste




On Fri, 19 Mar 2004 09:45:10 +1000
"Gary Ruben" <ga...@em...> wrote:

> Hi Jean-Baptiste,
> Your problem is that polyfit (and polyval) expect Numeric array arguments=
, so you need to do:
>=20
> >>> x=3Darray([1,2,3])
> >>> y=3Darray([1,2,1])
> >>> p=3Dpolyfit(x,y,2)
> >>> p
> array([-1.,  4., -2.])
> >>> polyval(p,array([1,2,3]))
> array([ 1.,  2.,  1.])
>=20
> Note that your example only has 3 points, so can fit a 2nd order polynomi=
al exactly as I've done.
> If you try to fit a 3rd order, the method polyfit is using seems to fail.=
 ie.
> >>> p=3Dpolyfit(x,y,3)
> >>> p
> array([ 1.09375, -5.0625 ,  7.125  , -2.875  ])
> >>> polyval(p,array([1,2,3]))
> array([ 0.28125, -0.125  ,  2.46875])
>=20
> ideally p would have been array([0., -1.,  4., -2.]) so you'll have to be=
 careful.
>=20
> Gary
>=20
> ----- Original Message -----
> From: Jean-Baptiste Cazier <Jea...@de...>
> Date: Thu, 18 Mar 2004 14:36:45 +0000
> To: mat...@li...
> Subject: [Matplotlib-users] Polyfit
>=20
> > S=E6ll=20
> >=20
> > One mroe question from me today :)
> >=20
> > I have some trouble running polyfit with matplotlib-0.52
> > Can you please help me finding out what I do wrong=20
> > I give a list of x values and y values as well as the degree of the des=
ired polynome. But all I get is the following error
> >=20
> > >>> x=3D[1,2,3]
> > >>> y=3D[1,2,1]
> > >>> polyfit(x,y,3)
> > Traceback (most recent call last):
> >   File "<<console>>", line 1, in ?
> >   File "/usr/lib/python2.2/site-packages/matplotlib/mlab.py", line 341,=
 in polyfit
> >     X =3D Matrix(vander(x, N+1))
> >   File "/usr/lib/python2.2/site-packages/matplotlib/mlab.py", line 383,=
 in vander
> >     X =3D ones( (len(x),N), x.typecode())
> > AttributeError: 'list' object has no attribute 'typecode'
> >=20
> >=20
> > Any idea ?
> >=20
> > Thanks
> >=20
> > Jean-Baptiste
> >=20
> > --=20
> > -----------------------------
> > Jea...@de...
> >=20
> > Department of Statistics
> > deCODE genetics     Sturlugata,8
> > 570 2993          101 Reykjav=EDk
> >=20
> >=20
> >=20
> > -------------------------------------------------------
> > This SF.Net email is sponsored by: IBM Linux Tutorials
> > Free Linux tutorial presented by Daniel Robbins, President and CEO of
> > GenToo technologies. Learn everything from fundamentals to system
> > administration.http://ads.osdn.com/?ad_id=1470&alloc_id638&op=3Dclick
> > _______________________________________________
> > Matplotlib-users mailing list
> > Mat...@li...
> > https://lists.sourceforge.net/lists/listinfo/matplotlib-users
> >=20
>=20
> --=20
> ___________________________________________________________
> Sign-up for Ads Free at Mail.com
> http://promo.mail.com/adsfreejump.htm
>=20


--=20
-----------------------------
Jea...@de...

Department of Statistics
deCODE genetics     Sturlugata,8
570 2993          101 Reykjav=EDk

Hi John,

I'm (slowly) getting around to doing all of the things needed to bring
backend_wx up to date (as far as possible). backend_wxagg will arrive, bu=
t
I'm trying to get some other things into backend_wx first, specifically:

- Support for images (which is turning out to be trickier than I thought)
- Support for the object picker (which should be easy)
- Support Mathtext

The problem of Mathtext support is a superset of the image support proble=
m.

The approach which I'm looking at is to use wxImage, which has a fast
method for loading data (wxImage.SetData()) - ths expects a C string of
length width*height*3 (in format RGBRGBRGB...).

Not sure what format im.as_str() returns as I can't find any documentatio=
n
(the im parameter to RendererWx.draw_image() is an instance of
matplotlib.image, I assume), so I'm stuck (or was a couple of nights ago)=
.

As you say, writing wxAgg is really pretty straightforward, and it's on m=
y
(ever lengthening) ToDo list... At the moment I don't have anything in a
usable state.

Regards

Jeremy

John Hunter said:
>>>>>> "Flavio" =3D=3D Flavio Codeco Coelho <fcc...@ci...>
>>>>>> writes:
>
>     Flavio> Hi, I use matplotlib for a math modelling software.
>
>     Flavio> I would like to create a figure, using the mathtext
>     Flavio> module, that would consist entirely of a list of
>     Flavio> equations.
>
>     Flavio> This figure would be embedded in WX.
>
>     Flavio> can anyone give me some pointer on how to get started?
>
> First port mathtext to wx <wink>.  There are two ways to do this:
>
>   * Write WXAgg:  This is easier than you think.
>
>   * Use the image_as_str method that ft2font provides to get a pixel
>     array from the math fonts and transfer them to the wx canvas using
>     the wx API.  Something like draw_from_rgba.  I don't know WX very
>     well.  Is there a WX method that allows you to draw from a
>     character buffer or array?
>
> Jeremy earlier expressed some interest in WXAgg but I don't know what
> the current status of that is.
>
> After that is done, we can move on to your question.  Hint: see
> examples/alignment_test.py for examples of laying out just text using
> 0,1 coords.
>
> JDH
>

Hello,

Is it possible to change the angle at which tick labels are displayed?  I'm
trying to avoid overlapping labels when the labels are somewhat long.

Thanks in advance,
Mike

>>>>> "Flavio" == Flavio Codeco Coelho <fcc...@ci...> writes:

    Flavio> Hi, I use matplotlib for a math modelling software.

    Flavio> I would like to create a figure, using the mathtext
    Flavio> module, that would consist entirely of a list of
    Flavio> equations.

    Flavio> This figure would be embedded in WX.

    Flavio> can anyone give me some pointer on how to get started?

First port mathtext to wx <wink>.  There are two ways to do this:

  * Write WXAgg:  This is easier than you think.  

  * Use the image_as_str method that ft2font provides to get a pixel
    array from the math fonts and transfer them to the wx canvas using
    the wx API.  Something like draw_from_rgba.  I don't know WX very
    well.  Is there a WX method that allows you to draw from a
    character buffer or array?

Jeremy earlier expressed some interest in WXAgg but I don't know what
the current status of that is.

After that is done, we can move on to your question.  Hint: see
examples/alignment_test.py for examples of laying out just text using
0,1 coords.

JDH

>>>>> "Jean-Baptiste" == Jean-Baptiste Cazier <Jea...@de...> writes:

   AttributeError: 'list' object has no attribute 'typecode'

Hint: if you paste the error message into google and click "I'm
Feeling Lucky", you'll get an answer to your question.

But thanks for letting me know; I patched polyfit to convert lists to
arrays with

  x = asarray(x)
  y = asarray(y)

JDH

>>>>> "Dominique" == Dominique Orban <Dom...@po...> writes:

    Dominique> Regarding my previous message on TeX labels, it would
    Dominique> seem that having parentheses in there mix up the
    Dominique> alignment. Not "regular" text, as i previously
    Dominique> suggested.

This makes more sense.

All the symbols that come from cmex10 (a TeX computer modern font)
have some funny alignment that I have not been able to figure out
properly and so I deal with them in some hackish ways that you have
just experienced.  Thanks for the report, because it lets me know
where the hacks are failing.  

But your post gave me a better idea.  Since parentheses are so common,
and are defined in a number of the font files, I can use the
parentheses from a font file that doesn't have this strange offset
problem.

Edit matplotlib.mathtext.py and comment out the following code and
replace it with the code below it

    #'('             : ('cmex10.ttf', 'A1'),
    #r'\leftparen'   : ('cmex10.ttf', 'A1'),
    #')'             : ('cmex10.ttf', 'A2'),
    #r'\rightparen'  : ('cmex10.ttf', 'A2'),

    #'['              : ('cmex10.ttf', 'A3'),
    #r'\leftbracket'  : ('cmex10.ttf', 'A3'),
    #']'              : ('cmex10.ttf', 'A4'),
    #r'\rightbracket' : ('cmex10.ttf', 'A4'),    

    '('             : ('cmr10.ttf', '28'),
    r'\leftparen'   : ('cmr10.ttf', '28'),
    ')'             : ('cmr10.ttf', '29'),
    r'\rightparen'  : ('cmr10.ttf', '29'),

    '['              : ('cmr10.ttf', '5B'),
    r'\leftbracket'  : ('cmr10.ttf', '5B'),
    ']'              : ('cmr10.ttf', '5D'),
    r'\rightbracket' : ('cmr10.ttf', '5D'),    

This takes the symbols (, ), [ and ] from computer modern roman rather
than computer modern extensions and the alignment works perfectly.

Note also that vertical alignment of mathtext (ylabels) is not yet
supported.  Feel free to bug me if this is an issue.

I expect plenty more issues to crop up with mathtext since it is
not widely tested and I am not Knuth so please let me know when you
find them.  The author of pyparsing has been helping me with the
parsing problem that prevents x_i_j from parsing properly but I
haven't been able to get to it yet. 

    Dominique> A final comment, using gca().set_yticks( ... ) prints a
    Dominique> large number of messages "<matplotlib.axis.YTick
    Dominique> instance at ...>". There must be a print somethere.

You're in interactive mode right?  In a python shell

>>> 2+2
4
>>> x = 2+2
>>>


Ie, an expression which is not assigned to a name is printed in the
shell in interactive mode.  set_ticks returns a list of tick labels to
allow you to do things like

  labels = gca().set_yticks(['a', 'b', 'c'])
  set(labels, 'color', 'r')

The point is, if you assign the return value of set_ticks a name, it
should no longer print to the shell.  Ditto for other plot functions
that return a value.  If this doesn't cure you, let me know.  A
residual print is always a possibility.

JDH 

Regarding my previous message on TeX labels, it would seem that having 
parentheses in there mix up the alignment. Not "regular" text, as i 
previously suggested.

Dominique

First of all, i am blown away by the last two releases. Congratulations. 
I love TkAgg and the new TeX capabilities.

I have been feeling like a contour plot capability was missing from the 
current release. Since imshow is so much faster than pcolor, it would 
seem that it could do the job. How would you go about suppressing the 
colors altogether and plotting only the 'contours' (borders between 
different colors i guess)? If this is doable in a few commands, perhaps 
there could be a shortcut called 'contour', as in Matlab, to draw 
contour plots of a function of 2 variables?

Titles appear differently when they contain TeX commands, depending on 
whether or not they also contain regular text. For instance:

- title( r'$\rm{This is } \psi(\omega)$' )
   appears nicely, although the spacing in the "regular" text looks 
unequal on my monitor. But:

- title( r'$\psi(\omega)$' )
   alone, shows only the top of the symbols \psi(\omega)---it looks like 
the box that contains the text is placed too low, behind the plot. Same 
happens with [xy]label. Surprisingly, xlabel( r'$\omega$' ) works fine.

Also in the documentation for matplotlib.mathtext, are there dollar 
signs missing in the first example?

In the documentation for imshow(), i guess 'ColorMap' should actually be 
'Colormap' (lowercase m)?! I couldn't find any 'ColorMap'.

A final comment, using gca().set_yticks( ... ) prints a large number of 
messages "<matplotlib.axis.YTick instance at ...>". There must be a 
print somethere.

Great job!
Dominique

>>>>> "Jean-Baptiste" =3D=3D Jean-Baptiste Cazier <Jean-Baptiste.cazier@d=
ecode.is> writes:

    Jean-Baptiste> S=E6ll !

    Jean-Baptiste> I followed you advice to use directly axes to
    Jean-Baptiste> define my subplots fig =3D Figure(figsize=3D(8,4),
    Jean-Baptiste> dpi=3D100)

    #ax =3D Subplot(fig, 211)
    ax =3D Plot.axes([0.1,0.3,0.8,0.7])
    fig.add_axis(ax)
    #mrks =3D Subplot(fig, 212)
    mrks =3D Plot.axes([0.1,0.1,0.8,0.15], axisbg=3D'c')
    fig.add_axis(mrks)


"Plot" is not from matplotlib.  Please post a complete working
matplotlib example that replicates your problem and I'll take a look.

It looks like you are mixing the matlab interface with the OO
interface.  axes is from matplotlib.matlab.  If you want to use the OO
interface, use =20

    from matplotlib.figure import Figure       =20
    from matplotlib.axes import Axes, Subplot
    # etc, etc

    ax =3D Axes(fig, [0.1, 0.3, 0.8, 0.7])
    fig.add_axis(ax)

    mrks =3D Axes(fig, [0.1, 0.1, 0.8, 0.15], axisbg=3D'c')
    fig.add_axis(mrks)

JDH

>>>>> "Jean-Baptiste" == Jean-Baptiste Cazier <Jea...@de...> writes:

    Jean-Baptiste> If I try to call figlegend from the canvas,
    Jean-Baptiste> canvas.Figure or canvas.Figure.axes[0], I get an
    Jean-Baptiste> erro message as figlegend is not defined in any of
    Jean-Baptiste> these contexts canvas.figure.figlegend(tuple([i[1]
    Jean-Baptiste> for i in d]),tuple([i[0] for i in d]),'upper
    Jean-Baptiste> center') AttributeError: Figure instance has no
    Jean-Baptiste> attribute 'figlegend'

In order to trace what command you should be using to go from the
matlab interface to the OO API, do the following

Go to matlab.py and find the command you want to use.  In this case
it's figlegend.  Search for 'def figlegend'

You'll find:

def figlegend(handles, labels, loc):
    'snip documentation'
    l = gcf().legend(handles, labels, loc)
    draw_if_interactive()
    return l


The critical line is

    l = gcf().legend(handles, labels, loc)

gcf() returns the current Figure instance.  Hence matlab.figlegend is
calling Figure.legend.

This should help,
JDH

S=E6ll=20

One mroe question from me today :)

I have some trouble running polyfit with matplotlib-0.52
Can you please help me finding out what I do wrong=20
I give a list of x values and y values as well as the degree of the desired=
 polynome. But all I get is the following error

>>> x=3D[1,2,3]
>>> y=3D[1,2,1]
>>> polyfit(x,y,3)
Traceback (most recent call last):
  File "<<console>>", line 1, in ?
  File "/usr/lib/python2.2/site-packages/matplotlib/mlab.py", line 341, in =
polyfit
    X =3D Matrix(vander(x, N+1))
  File "/usr/lib/python2.2/site-packages/matplotlib/mlab.py", line 383, in =
vander
    X =3D ones( (len(x),N), x.typecode())
AttributeError: 'list' object has no attribute 'typecode'


Any idea ?

Thanks

Jean-Baptiste

--=20
-----------------------------
Jea...@de...

Department of Statistics
deCODE genetics     Sturlugata,8
570 2993          101 Reykjav=EDk

>>>>> "Jean-Baptiste" == Jean-Baptiste Cazier <Jea...@de...> writes:

    Jean-Baptiste> I do not see the utilitiy of the b variable. Is it
    Jean-Baptiste> to keep some kind of scheme ? or just a left over
    Jean-Baptiste> from set_visible ?

It's a bug, just use

    def get_visible(self):
        "return the artist's visiblity"
        return self._visible 

    Jean-Baptiste> By the way on which backend is the alpha channel
    Jean-Baptiste> supported

Agg, TkAgg, GTKAgg.

Since I know you are a GTK user, I suspect you'll be interested in
GTKAgg.  It's identical to the GTK backend in terms of the widget set,
but the figures are renderer with agg.

I know you are interested in object_picker so I might as well deal
with that now :-).  You have to make a couple of minor changes to
object_picker.py to work with GTKAgg.  In my apps I import
FigureCasvasGTK or FigureCanvasGTKAgg renamed as FigureCanvas, which
makes it easy to switch back and forth if you want.

import matplotlib
matplotlib.use('GTKAgg')

from matplotlib.backends.backend_gtk import NavigationToolbar, \
     error_msg, colorManager
from matplotlib.backends.backend_gtkagg import FigureCanvasGTKAgg as FigureCanvas


Then create your picker canvas like

class PickerCanvas(FigureCanvas):
             
    def button_press_event(self, widget, event):
        width = self.figure.bbox.x.interval()
        height = self.figure.bbox.y.interval()
        
        self.pick(event.x, height-event.y)


The rest is OK.



JDH

>>>>> "Greg" == Greg Whittier <gr...@th...> writes:

    Greg> I was ready to produce a polar plot and, unless I'm missing
    Greg> something this doesn't seem to be a feature.  Looking at the
    Greg> list archives and the future direction on the website I
    Greg> can't find the word "polar" anywhere.  Is this feature there
    Greg> in some non-obvious way or is not implemented.  Are there
    Greg> any plans?

I guess it's a good sign when you are surprised *not to find
something* rather than the converse :-)

There are no polar plots currently.  This should be documented on the
goals page - thanks for reminding me.

matplotlib development is driven by what I need and what people ask
for.  Noone has asked for polar plots yet, but since there were two
requests today, I guess it's officially on the list of things to do.

If anyone else is interested in taking a stab at this, let me know.
The relevant classes are axis.Axis, transforms.Transform and
axes.Axes.

JDH

Hi,

I use matplotlib for a math modelling software.

I would like to create a figure, using the mathtext module, that would 
consist entirely of a list of equations.

This figure would be embedded in WX.

can anyone give me some pointer on how to get started?

thanks,

Flavio

Hello,
.matplotlibrc has:
figure.figsize   : 8, 6    # figure size in inches
figure.dpi       : 80      # figure dots per inch
figure.facecolor : 0.75    # figure facecolor; 0.75 is scalar gray
figure.edgecolor : w       # figure edgecolor; w is white

yet figure.py does not use the default figsize and dpi, it has:
class Figure(Artist):
    def __init__(self, figsize, dpi,
                 facecolor=rcParams['figure.facecolor'],
                 edgecolor=rcParams['figure.edgecolor'],
                 ):

shouldn't it be something like:
class Figure(Artist):
    def __init__(self,
          	 figsize = rcParams['figure.figsize'],
           	 dpi     = rcParams['figure.dpi'],
                 facecolor=rcParams['figure.facecolor'],
                 edgecolor=rcParams['figure.edgecolor'],
                 ):

so it uses all the defaults and is consistent with the figure() function
in matlab.py?

Regards
Steve

S=E6ll !

I followed you advice to use directly axes to define my subplots
    fig =3D Figure(figsize=3D(8,4), dpi=3D100)

    #ax =3D Subplot(fig, 211)
    ax =3D Plot.axes([0.1,0.3,0.8,0.7])
    fig.add_axis(ax)
    #mrks =3D Subplot(fig, 212)
    mrks =3D Plot.axes([0.1,0.1,0.8,0.15], axisbg=3D'c')
    fig.add_axis(mrks)

However,unlike in your axes_demo.py, my 2 axes are not linked to the size o=
f the window and do not resize with it !

Is there a flag to turn on to allow my manually created axes to behave like=
 Subplots ?

Takk

Kv.

Jean-Baptiste


>   - Can I change the size taken by each of the Suplots ?=20
>=20
> Just use axes.  Subplot derives from Axes.  With axes, you can set the
> size of your subplot with a rect [left, bottom, width, height]
>=20
> http://matplotlib.sourceforge.net/matplotlib.matlab.html#-axes
> http://matplotlib.sourceforge.net/matplotlib.axes.html
> http://matplotlib.sourceforge.net/screenshots.html#axes_demo




--=20
-----------------------------
Jea...@de...

Department of Statistics
deCODE genetics     Sturlugata,8
570 2993          101 Reykjav=EDk

S=E6l !

I have installed matplotlib-0.52 and succesfully ran the figlegend example.
However when I try to run it directly in my program into a figure i am not =
as successful:
- I can create the legend with=20
leg=3Dmatplotlib.matlab.figlegend(tuple([i[1] for i in d]),tuple([i[0] for =
i in d]),'upper center')
leg.draw()
But it does not appear anywhere

If I try to call figlegend from the canvas, canvas.Figure or canvas.Figure.=
axes[0], I get an erro message as figlegend is not defined in any of these =
contexts
	canvas.figure.figlegend(tuple([i[1] for i in d]),tuple([i[0] for i in d]),=
'upper center')
	AttributeError: Figure instance has no attribute 'figlegend'



How can I get my figlegend to appear in my window ?

Takk

Jean-Baptiste



On Fri, 12 Mar 2004 20:17:25 -0800
mat...@li... wrote:

> Send Matplotlib-users mailing list submissions to
> 	mat...@li...
>=20
> To subscribe or unsubscribe via the World Wide Web, visit
> 	https://lists.sourceforge.net/lists/listinfo/matplotlib-users
> or, via email, send a message with subject or body 'help' to
> 	mat...@li...
>=20
> You can reach the person managing the list at
> 	mat...@li...
>=20
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of Matplotlib-users digest..."
>=20
>=20
> Today's Topics:
>=20
>    1. invisilbe line (Jean-Baptiste Cazier)
>    2. Re: invisilbe line (John Hunter)
>=20
> --__--__--
>=20
> Message: 1
> Date: Fri, 12 Mar 2004 12:40:19 +0000
> From: Jean-Baptiste Cazier <Jea...@de...>
> To: mat...@li...
> Organization: deCODE Genetics
> Subject: [Matplotlib-users] invisilbe line
>=20
> S=3DE6l !
>=20
>=20
> Is there a way to "turn-off" lines without removing the data ?
> My goal is to hide some lines in a plot wihtout losing the data so I can =
sh=3D
> ow it again later.
> I can do=3D20
> # Hide the line
> x=3D3Dline.get_xdata()
> y=3D3Dline.get_ydata()
> line.set_data([],[])
>=20
> # Reset the line
> line.set_data(x,y)
>=20
> But I would prefer I more elegant way like
> line.hide()
> line.show()
>=20
> Would it be possible to get something like that ?
>=20
> Thanks
>=20
> Jean-Baptiste
>=20
>=20
> --=3D20
> -----------------------------
> Jea...@de...
>=20
> Department of Statistics
> deCODE genetics     Sturlugata,8
> 570 2993          101 Reykjav=3DEDk
>=20
>=20
>=20
> --__--__--
>=20
> Message: 2
> To: Jean-Baptiste Cazier <Jea...@de...>
> Cc: mat...@li...
> Subject: Re: [Matplotlib-users] invisilbe line
> From: John Hunter <jdh...@ac...>
> Date: Fri, 12 Mar 2004 12:29:18 -0600
>=20
> --=3D-=3D-=3D
> Content-Transfer-Encoding: quoted-printable
>=20
> >>>>> "Jean-Baptiste" =3D3D=3D3D Jean-Baptiste Cazier <Jean-Baptiste.cazi=
er@d=3D
> ecode.is> writes:
>=20
>     Jean-Baptiste> S=3DE6l !  Is there a way to "turn-off" lines without
>     Jean-Baptiste> removing the data ?  My goal is to hide some lines
>     Jean-Baptiste> in a plot wihtout losing the data so I can show it
>     Jean-Baptiste> again later.  I can do # Hide the line
>     Jean-Baptiste> x=3D3Dline.get_xdata() y=3D3Dline.get_ydata()
>     Jean-Baptiste> line.set_data([],[])
>=20
> This can be done very easily (for any artist) with a minor
> modification of artist.py.  The base class forewards all drawing to
> the derived classes so no other changes are required.  Just replace
> artist.py with the attached file below and then you can do:
>=20
>     from matplotlib.matlab import *
>=20
>     x =3D3D arange(0.0, 1.0, 0.05)
>     l1, l2 =3D3D plot(x, sin(2*pi*x), x, sin(4*pi*x))
>     l1.set_visible(False)
>     show()
>=20
>=20
> --=3D-=3D-=3D
> Content-Type: application/octet-stream
> Content-Disposition: attachment; filename=3Dartist.py
>=20
> from __future__ import division
> import sys
>=20
> from cbook import True, False, enumerate
> from transforms import RWRef
>=20
> class DPI(RWRef):
>     'DPI as a read/write reference'
>     pass
>    =20
>    =20
> class Artist:
>     """
>     Abstract base class for someone who renders into a Figure
>=20
>     Public attributes
>       dpi  : a DPI instance
>       bbox : a Bound2D instance in display coords
>       transform : a Transform instance
>       renderer  : the last renderer used to draw, or None
>     """
>=20
>     aname =3D 'Artist'
>     def __init__(self, dpi, bbox):       =20
>         self.renderer =3D None
>         self._lod =3D False
>         self.dpi =3D dpi
>         self.bbox =3D bbox
>         self._clipOn =3D True
>         self._alpha =3D 1.0
>         self._visible =3D True
>        =20
>     def get_alpha(self):
>         """
>         Return the alpha value used for blending - not supported on
>         all backends
>         """
>         return self._alpha
>=20
>     def get_visible(self, b):
>         "return the artist's visiblity"
>         return self._visible=20
>=20
>     def get_clip_on(self):
>         'Return whether artist uses clipping'
>         return self._clipOn
>=20
>     def set_clip_on(self, b):
>         'Set whether artist is clipped to bbox'       =20
>         self._clipOn =3D b
>=20
>     def set_visible(self, b):
>         "set the artist's visiblity"
>         self._visible =3D b
>    =20
>     def set_child_attr(self, attr, val):
>         """
>         Set attribute attr for self, and all child artists
>         """
>         setattr(self, attr, val)
>         for c in self.get_child_artists():
>             c.set_child_attr(attr, val)
>=20
>=20
>     def get_child_artists(self):
>         'Return all artists contained in self'
>         return []
>=20
>     def get_window_extent(self, renderer=3DNone):
>         'Return the window extent of the Artist as a Bound2D instance'
>         raise NotImplementedError('Derived must override')
>=20
>=20
>     def get_dpi(self):
>         """
>         Get the DPI of the display
>         """
>         return self._dpi
>=20
>=20
>     def draw(self, renderer=3DNone, *args, **kwargs):
>         'Derived classes drawing method'
>         if not self._visible: return=20
>         if renderer is None: renderer =3D self.renderer
>         if renderer is None: return
>         self.renderer =3D renderer
>        =20
>         self._draw(renderer, *args, **kwargs)
>=20
>     def _draw(self, renderer, *args, **kwargs):
>         'Derived classes drawing method'
>         raise NotImplementedError, 'Derived must override'
>=20
>     def set_alpha(self, alpha):
>         """
>         Set the alpha value used for blending - not supported on
>         all backends
>         """
>         self._alpha =3D alpha
>=20
>     def set_lod(self, on):
>         """
>         Set Level of Detail on or off.  If on, the artists may examine
>         things like the pixel width of the axes and draw a subset of
>         their contents accordingly
>         """
>         self._lod =3D on
>=20
>        =20
>=20
>=20
>=20
> --=3D-=3D-=3D
>=20
>=20
> You'll still have a little function call overhead, but it should be
> *significantly faster* than your current approach.
>=20
> JDH
>=20
> --=3D-=3D-=3D--
>=20
>=20
>=20
> --__--__--
>=20
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>=20
>=20
> End of Matplotlib-users Digest


--=20
-----------------------------
Jea...@de...

Department of Statistics
deCODE genetics     Sturlugata,8
570 2993          101 Reykjav=EDk

S=E6l !

I think there is a bug in the definition of get_visible in the artist.py
    def get_visible(self, b):
        "return the artist's visiblity"
        return self._visible

I do not see the utilitiy of the b variable. Is it to keep some kind of sch=
eme ? or just a left over from set_visible ?

By the way on which backend is the alpha channel supported

Takk
Kv.

Jean-Baptiste

--=20
-----------------------------
Jea...@de...

Department of Statistics
deCODE genetics     Sturlugata,8
570 2993          101 Reykjav=EDk

>
>
>I was ready to produce a polar plot and, unless I'm missing something
>this doesn't seem to be a feature.  Looking at the list archives and the
>future direction on the website I can't find the word "polar" anywhere. 
>Is this feature there in some non-obvious way or is not implemented. 
>Are there any plans?
>  
>
I was actually about to ask the same question... Couldn't find any info 
either.. 

-- 
Peter Groszkowski         Gemini Observatory
Tel: +1 808 974-2509      670 N. A'ohoku Place
Fax: +1 808 935-9235      Hilo, Hawai'i 96720, USA

First, thanks for a great package.  I've been using it for xy plot and
like the intuitive interface and the output looks nice.

I was ready to produce a polar plot and, unless I'm missing something
this doesn't seem to be a feature.  Looking at the list archives and the
future direction on the website I can't find the word "polar" anywhere. 
Is this feature there in some non-obvious way or is not implemented. 
Are there any plans?

Thanks,
Greg

On Wed, 2004-03-17 at 15:51, Gary Pajer wrote:
> Thanks very much, guys!
> 
> -Gary
> 

You're welcome!  Anyone interested in TkAgg that hasn't updated since I
last announced changes should do so.  JDH discovered that the toolbar
was broken and I fixed it about an hour or so ago.

Regards,
Todd

> 
> ----- Original Message ----- 
> From: "Todd Miller" <jm...@st...>
> To: "John Hunter" <jdh...@ni...>
> Cc: "Gary Pajer" <pa...@in...>; <mat...@li...>
> Sent: Wednesday, March 17, 2004 11:38 AM
> Subject: Re: [Matplotlib-users] TkAgg in a Tkinter GUI frame?
> 
> 
> > On Tue, 2004-03-16 at 07:29, John Hunter wrote:
> > > >>>>> "Gary" == Gary Pajer <pa...@in...> writes:
> > >
> > >     Gary> I've been poking aroung a bit trying to see if I can locate
> > >     Gary> my plots in a frame in my own Tkinter GUI rather than a
> > >     Gary> stand-alone window.
> > >
> > >     Gary> It looks like it might be possible if I can, for example,
> > >     Gary> extract the frame instance from a TkAgg plot (or something
> > >     Gary> like that)
> > >
> > >     Gary> Can anyone comment or suggest a route?
> > >
> > > Todd, is this easily doable?
> >
> > As we all hoped, this was easy and is now in CVS.  I refactored
> > FigureManagerTkAgg and added FigureCanvasTkAgg to support the new
> > functionality.  FigureCanvasTkAgg defines get_tk_widget() to return
> > whatever tk widget is used to implement it. Currently it returns a Tk
> > canvas but I thought it would be best not to assume that will always be
> > the case.   Like other Tk widgets,  FigureCanvasTkAgg wants to be told
> > who its parent widget (master) is at construction time.
> >
> > > Could you write an embedding_in_tk.py
> > > example along the lines of embedding_in_gtk and embedding_in_wx?
> >
> > This is also in CVS.
> >
> > >
> > Regards,
> > Todd
> >
> > >
> > >
> > > -------------------------------------------------------
> > > This SF.Net email is sponsored by: IBM Linux Tutorials
> > > Free Linux tutorial presented by Daniel Robbins, President and CEO of
> > > GenToo technologies. Learn everything from fundamentals to system
> > > administration.http://ads.osdn.com/?ad_id=1470&alloc_id=3638&op=click
> > > _______________________________________________
> > > Matplotlib-users mailing list
> > > Mat...@li...
> > > https://lists.sourceforge.net/lists/listinfo/matplotlib-users
> > -- 
> > Todd Miller <jm...@st...>
> >
> 
> 
> 
> -------------------------------------------------------
> This SF.Net email is sponsored by: IBM Linux Tutorials
> Free Linux tutorial presented by Daniel Robbins, President and CEO of
> GenToo technologies. Learn everything from fundamentals to system
> administration.http://ads.osdn.com/?ad_id=1470&alloc_id=3638&op=click
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
-- 
Todd Miller <jm...@st...>