Thread: [Matplotlib-users] plotting two lists

i'd just like to ask how to make a simple graph of two lists???
i've seen this in the tutorials...

a = self.fig.add_subplot(111)
t = numpy.arange(0.0,3.0,0.01)
s = numpy.sin(2*numpy.pi*t)
c = numpy.cos(2*numpy.pi*t)
a.plot(t,s)
a.plot(t,c)

=============
so if i am to plot two lists say listY[] and listX[], i should do this:

a.plot(listY, listX)

=============

please, any help will be greatly appreciated!

ok, so i've done plotting two list on boa/wxpython
now, i want to add labels and everything else to my graph...
adding labels i've done this:

      self.figure = Figure()
      self.axes = self.figure.add_subplot(111)
       
      self.axes.plot(parent.listX,parent.listY, 'bo')
      
      self.axes.xlabel(parent.Xaxis.GetStringSelection())
      self.axes.ylabel(parent.Xaxis.GetStringSelection())
      
      self.canvas = FigureCanvas(self, -1, self.figure)

===========================================
but i'm getting some error that says:
Traceback (most recent call last):
  File "E:\final docu\Folder4.2pssl2\wxFrame1.py", line 729, in
OnGraphOldFileButton
    wxFrame2.create(self).Show(true)
  File "E:\final docu\Folder4.2pssl2\wxFrame2.py", line 16, in create
    return wxFrame2(parent)
  File "E:\final docu\Folder4.2pssl2\wxFrame2.py", line 39, in __init__
    self.axes.xlabel(parent.Xaxis.GetStringSelection())

AttributeError: Subplot instance has no attribute 'xlabel'

==============================================
what should i do???

>>>>> "Jan" =3D=3D Jan Rienyer Gadil <jr...@gm...> writes:

    Jan> ok, so i've done plotting two list on boa/wxpython now, i
    Jan> want to add labels and everything else to my graph...  adding
    Jan> labels i've done this:

Glad to see you are getting this working...

    self.figure =3D Figure()=20
    self.axes =3D self.figure.add_subplot(111)=20=20=20=20=20=20=20
    self.axes.plot(parent.listX,parent.listY, 'bo')=20=20=20=20=20=20
    self.axes.xlabel(parent.Xaxis.GetStringSelection())

    Jan> AttributeError: Subplot instance has no attribute 'xlabel'

Rather than giving you the answer, I'll show you how to find it....

You can use python's introspection capability (help, dir, type) to ask
an object about itself.  You can insert print statements directly into
your code

  print dir(self.axes)  # see below the results of dir(self.axes)

and look for methods that have the right names.  Or you can keep a
python shell open and use the python help system.  If for example, at
the shell you do help(self.axes), you'll find

  Help on instance of Subplot:
  <matplotlib.axes.Subplot instance>

So self.axes is a Subplot instance.  You can then import the Subplot
class and get much richer help by doing

  >>> from matplotlib.axes import Subplot
  >>> help(Subplot)=20=20


If you don't like working from the shell, head on over to the class
docs at http://matplotlib.sourceforge.net/classdocs.html and click on
the "axes" link and near the top of your screen you'll seen a link
that reads

  Subplot(SubplotBase, Axes)

That means the subplot class is derived from SubplotBase and Axes.
Click on Subplot, and read through the available methods.  If you get
impatient, search the web page for "xlabel"

Good luck!
JDH



Python 2.3.3 (#2, Apr 13 2004, 17:41:29)
[GCC 3.3.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from matplotlib.figure import Figure
>>> fig =3D Figure()
>>> ax =3D fig.add_subplot(111)
>>> help(ax)

>>> dir(ax)
['__doc__', '__init__', '__module__', '_alpha', '_axisbg', '_cid', '_clipon=
', '_connected', '_contourHelper', '_contourLabeler', '_cursorProps', '_eve=
nts', '_frameon', '_get_lines', '_get_patches_for_fill', '_get_verts_in_dat=
a_coords', '_gridOn', '_hold', '_init_axis', '_label', '_lod', '_position',=
 '_send_xlim_event', '_send_ylim_event', '_set_artist_props', '_set_lim_and=
_transforms', '_sharex', '_sharey', '_transform', '_transformSet', '_visibl=
e', 'add_artist', 'add_collection', 'add_line', 'add_patch', 'add_table', '=
aname', 'artists', 'autoscale_view', 'axesPatch', 'axhline', 'axhspan', 'ax=
ison', 'axvline', 'axvspan', 'bar', 'barh', 'bbox', 'bottom', 'boxplot', 'c=
la', 'clabel', 'clear', 'clipbox', 'cohere', 'colNum', 'collections', 'conn=
ect', 'contour', 'contourf', 'csd', 'dataLim', 'disconnect', 'draw', 'error=
bar', 'figBottom', 'figH', 'figLeft', 'figW', 'figure', 'fill', 'fmt_xdata'=
, 'fmt_ydata', 'format_coord', 'format_xdata', 'format_ydata', 'get_alpha',=
 'get_axis_bgcolor', 'get_child_artists', 'get_clip_on', 'get_cursor_props'=
, 'get_figure', 'get_frame', 'get_images', 'get_label', 'get_legend', 'get_=
lines', 'get_position', 'get_transform', 'get_visible', 'get_xaxis', 'get_x=
gridlines', 'get_xlim', 'get_xscale', 'get_xticklabels', 'get_xticklines', =
'get_xticks', 'get_yaxis', 'get_ygridlines', 'get_ylim', 'get_yscale', 'get=
_yticklabels', 'get_yticklines', 'get_yticks', 'get_zorder', 'grid', 'has_d=
ata', 'hist', 'hlines', 'hold', 'images', 'imshow', 'in_axes', 'is_figure_s=
et', 'is_first_col', 'is_first_row', 'is_last_col', 'is_last_row', 'is_tran=
sform_set', 'ishold', 'left', 'legend', 'legend_', 'lines', 'loglog', 'numC=
ols', 'numRows', 'panx', 'pany', 'patches', 'pcolor', 'pcolor_classic', 'pi=
ck', 'pie', 'plot', 'plot_date', 'psd', 'quiver', 'right', 'rowNum', 'scale=
d', 'scatter', 'scatter_classic', 'semilogx', 'semilogy', 'set_alpha', 'set=
_axis_bgcolor', 'set_axis_off', 'set_axis_on', 'set_clip_box', 'set_clip_on=
', 'set_cursor_props', 'set_figure', 'set_frame_on', 'set_label', 'set_lod'=
, 'set_position', 'set_title', 'set_transform', 'set_visible', 'set_xlabel'=
, 'set_xlim', 'set_xscale', 'set_xticklabels', 'set_xticks', 'set_ylabel', =
'set_ylim', 'set_yscale', 'set_yticklabels', 'set_yticks', 'set_zorder', 's=
pecgram', 'spy', 'spy2', 'stem', 'table', 'tables', 'text', 'texts', 'title=
', 'toggle_log_lineary', 'top', 'transAxes', 'transData', 'update', 'update=
_datalim', 'update_datalim_numerix', 'update_from', 'viewLim', 'vlines', 'x=
axis', 'yaxis', 'zoomx', 'zoomy', 'zorder']
>>>

Hi,

I am trying to construct coloured contour maps, but when I do:

from pylab import *

clabel is not there.  Was this removed?  The docs suggest that clabel 
is part of the pylab module.

thanks,
Mark

Sorry - problem solved.  I was 0.01 versions behind on the computer I  
was using.  Thanks for adding such a great feature!
- Mark

On Apr 28, 2005, at 1:43 AM, Mark Engelhardt wrote:

> Hi,
>
> I am trying to construct coloured contour maps, but when I do:
>
> from pylab import *
>
> clabel is not there.  Was this removed?  The docs suggest that clabel  
> is part of the pylab module.
>
> thanks,
> Mark
>
>
>
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........................................................................ 
.....
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ma...@st...
http://www.stanford.edu/~marke/

On Thursday 31 March 2005 04:34 am, Jan Rienyer Gadil wrote:
> ok, so i've done plotting two list on boa/wxpython
> now, i want to add labels and everything else to my graph...
> adding labels i've done this:
>
>       self.figure = Figure()
>       self.axes = self.figure.add_subplot(111)
>
>       self.axes.plot(parent.listX,parent.listY, 'bo')
>
>       self.axes.xlabel(parent.Xaxis.GetStringSelection())
>       self.axes.ylabel(parent.Xaxis.GetStringSelection())
>
>       self.canvas = FigureCanvas(self, -1, self.figure)
>
> ===========================================
> but i'm getting some error that says:
> Traceback (most recent call last):
>   File "E:\final docu\Folder4.2pssl2\wxFrame1.py", line 729, in
> OnGraphOldFileButton
>     wxFrame2.create(self).Show(true)
>   File "E:\final docu\Folder4.2pssl2\wxFrame2.py", line 16, in create
>     return wxFrame2(parent)
>   File "E:\final docu\Folder4.2pssl2\wxFrame2.py", line 39, in __init__
>     self.axes.xlabel(parent.Xaxis.GetStringSelection())
>
> AttributeError: Subplot instance has no attribute 'xlabel'
>
> ==============================================
> what should i do???

Hi Jan,

axes.xlabel doesnt exist. What you are looking for is 

self.axes.set_xlabel(parent.Xaxis.GetStringSelection())
self.axes.set_ylabel(parent.Xaxis.GetStringSelection())

The Matplotlib devs have put a lot of effort into documenting the project. In 
situations like this, I often end up relying on the python interactive 
interpreter to find the method I am looking for:

from pylab import *
fig = figure()
ax = fig.add_subplot(111)
dir(ax)

or you could add a line in your own code:

      self.figure = Figure()
      self.axes = self.figure.add_subplot(111)

      self.axes.plot(parent.listX,parent.listY, 'bo')
      print dir(self.axes)

both would give you a list of available methods.

Hope this helps,

Darren

thanks to you all, that's a really big help!!! 


On Thu, 31 Mar 2005 09:38:26 -0500, Darren Dale <dd...@co...> wrote:
> On Thursday 31 March 2005 04:34 am, Jan Rienyer Gadil wrote:
> > ok, so i've done plotting two list on boa/wxpython
> > now, i want to add labels and everything else to my graph...
> > adding labels i've done this:
> >
> >       self.figure = Figure()
> >       self.axes = self.figure.add_subplot(111)
> >
> >       self.axes.plot(parent.listX,parent.listY, 'bo')
> >
> >       self.axes.xlabel(parent.Xaxis.GetStringSelection())
> >       self.axes.ylabel(parent.Xaxis.GetStringSelection())
> >
> >       self.canvas = FigureCanvas(self, -1, self.figure)
> >
> > ===========================================
> > but i'm getting some error that says:
> > Traceback (most recent call last):
> >   File "E:\final docu\Folder4.2pssl2\wxFrame1.py", line 729, in
> > OnGraphOldFileButton
> >     wxFrame2.create(self).Show(true)
> >   File "E:\final docu\Folder4.2pssl2\wxFrame2.py", line 16, in create
> >     return wxFrame2(parent)
> >   File "E:\final docu\Folder4.2pssl2\wxFrame2.py", line 39, in __init__
> >     self.axes.xlabel(parent.Xaxis.GetStringSelection())
> >
> > AttributeError: Subplot instance has no attribute 'xlabel'
> >
> > ==============================================
> > what should i do???
> 
> Hi Jan,
> 
> axes.xlabel doesnt exist. What you are looking for is
> 
> self.axes.set_xlabel(parent.Xaxis.GetStringSelection())
> self.axes.set_ylabel(parent.Xaxis.GetStringSelection())
> 
> The Matplotlib devs have put a lot of effort into documenting the project. In
> situations like this, I often end up relying on the python interactive
> interpreter to find the method I am looking for:
> 
> from pylab import *
> fig = figure()
> ax = fig.add_subplot(111)
> dir(ax)
> 
> or you could add a line in your own code:
> 
>       self.figure = Figure()
>       self.axes = self.figure.add_subplot(111)
> 
>       self.axes.plot(parent.listX,parent.listY, 'bo')
>       print dir(self.axes)
> 
> both would give you a list of available methods.
> 
> Hope this helps,
> 
> Darren
>