matplotlib-users Mailing List for matplotlib

On Mon, 2003-11-10 at 23:09, John Hunter wrote:
> >>>>> "Steve" == Steve Chaplin <ste...@ya...> writes:
> 
>     Steve> I've been receiving the error message "matplotlib requires
>     Steve> pygtk-1.99.16 or greater -- trying anyway.  Please hold on"
>     Steve> which is puzzling since I have pygtk 2.0 installed.
> 
> Is it possible you have both installed (eg, on a redhat 9 install the
> default pygtk is 1.99.14) and that you are importing the wrong one
> 
>     Steve> error message that pygtk.require('2.0') generates. I think
>     Steve> it would be improved by changing it to:
> 
> Good point.  I changed it.
> 
> 
>     Steve> "pygtk.require() must be called before importing gtk
>     Steve> matplotlib requires pygtk-1.99.16 or greater -- trying
>     Steve> anyway.  Please hold on"
> 
> 
> This looks like you imported gtk in your app/script before either
> 
>   1) doing the pygtk.require thing
>   2) importing matplotlib first
> 
> If you do either of these, does everything work fine for you?

I don't use pygtk.require() myself, since I'm just writing small
programs to run on my own system which has python 2.3.2 and pygtk 2.0
installed together.

The problem was in the import order
I was doing:
import gtk
import mylibrary  # which imports matplotlib

and was getting the warning message. Changing to

import mylibrary
import gtk

stops the warning appearing.

Steve

> 
> JDH
-- 
Steve Chaplin <ste...@ya...>

What's new in matplotlib 0.32

  wx python backend -- development version 

  Jeremy O'Donoghue has done an amazing job implementing the backend
  for wxpython. The code is still alpha and several of the features
  that will be available are under active development. See the code
  matplotlib/backends/backend_wx.py for a report on existing features
  and known bugs. If you have wxpython installed, you can take it for
  a test drive with 'python yourscript.py -dWX' and please report any
  bugs not listed in the KNOWN BUGS section of the wx src to the
  matplotlib-devel mailing list.

Pseudo color plots

  The pcolor command generates pseudo color plots. See
  http://matplotlib.sourceforge.net/screenshots.html#pcolor_demo and
  http://matplotlib.sourceforge.net/screenshots.html#mri_with_eeg for
  screenshots and some example code

Numerous small bugfixes

  Fixed reversed zoom tools, bug in ticklabel setting, bug in AFM font
  path setting for PS backend, fixed a label position bug.  Thanks for
  the bug reports!

John Hunter

Hi John,

The patch worked for me.   :-)


JH:    def is_last_row(self):

Nice, but maybe not enough. If the plots don't fill the bottom row, (say 7
plots on a 3x3 grid), it'll leave some columns with no xticklabels.  We'd
need something like
	is_bottom()
But that would require knowing how many subplots there are, which subplot
doesn't do, and probably shouldn't.

-C

-- 
Charles R. Twardy                    www.csse.monash.edu.au/~ctwardy
Monash University                    sarbayes.org
Computer Sci. & Software Eng.
+61(3) 9905 5823 (w)  5146 (fax)

>>>>> "Charles" == Charles  <ct...@cs...> writes:

    Charles> Hi John, I added one line that shows the problem. If you
    Charles> do a set_xticks() first, then the usual ([]) doesn't
    Charles> blank them. Here's code that should suppress the xticks
    Charles> for all but the bottom-most graphs in each column. It
    Charles> works if you comment out the set_xticks line (HERE HERE
    Charles> HERE).

Hi Charles,

As an aside, you'll be interested in these super secret undocumented
methods of the Subplot class, which I implemented so I wouldn't have
to do the if i % COLS == 1 tricks that I came to know and love in
matlab.  I too find myself making lots-o-subplots and blanking out the
labels

Subplot methods:

    def is_first_col(self):
    def is_first_row(self):
    def is_last_row(self):
    def is_last_col(self):

which enables you to write your loop

for i in range(1,NUMPLOTS+1):
    ax = subplot (ROWS, COLS, i)
    ax.set_xticks((0,1,2))     
    title('Simple ' + str(i))
    
    if ax.is_first_col(): ax.set_ylabel('voltage (mV)')
    else: ax.set_yticklabels ([])

    if ax.is_last_row():  ax.set_xlabel('time (s)')
    else: ax.set_xticklabels ([])

Now onto your problem.  Thanks for the example script.  I am not sure
which version of matplotlib you are working with, but it appears there
is a clear bug in Axis.set_ticklabels in the part which reads

        for s, label in zip(self._ticklabelStrings, self._ticklabels):
            label.set_text(s)
            label.update_properties(override)

when len(self._ticklabelStrings) is less than len(self._ticklabels),
the label text doesn't get updated.  Duh!

Something like this should work better.  At least with
matplotlib-0.32a it handles your example

    def set_ticklabels(self, ticklabels, *args, **kwargs):
        """
        Set the text values of the tick labels.  ticklabels is a
        sequence of strings.  Return a list of AxisText instances
        """
        ticklabels = ['%s'%l for l in ticklabels]
        
        self._ticklabelStrings = ticklabels
        override = {}
        override = backends._process_text_args(override, *args, **kwargs)

        Nnew = len(self._ticklabelStrings)
        existingLabels = self.get_ticklabels()
        for i, label in enumerate(existingLabels):
            if i<Nnew: label.set_text(self._ticklabelStrings[i])
            else: label.set_text('')
            label.update_properties(override)
        return existingLabels

    Charles> Is this comment better for -users or -devel?  Or bug
    Charles> tracking?

I think users, since my answer includes a *possible* fix which others
may find useful.  Let me know how this works for you; I'll take a
closer look on Thurs when I have some breathing room again.

JDH

Hi John,

I added one line that shows the problem. If you do a set_xticks() first,
then the usual ([]) doesn't blank them. Here's code that should suppress
the xticks for all but the bottom-most graphs in each column. It works if
you comment out the set_xticks line (HERE HERE HERE).

Is this comment better for -users or -devel?  Or bug tracking?
	-Charles

# -*- Mode: Python; py-indent-offset: 4 -*-
# Simple example to demonstrate ticklabel problem
# If you don't set_ticks first, the following works fine.
# If you do set_ticks, then ([]) doesn't blank the ticklabels.
# --crt

from matplotlib.matlab import *
NUMPLOTS = 8
COLS =     3
ROWS =     NUMPLOTS / COLS
if NUMPLOTS % COLS: ROWS += 1

t = arange(0.0, 2.0, 0.01)
s = sin(2*pi*t)
for i in range(1,NUMPLOTS+1):
    ax = subplot (ROWS, COLS, i)
    plot(t, s)

for i in range(1,NUMPLOTS+1):
    ax = subplot (ROWS, COLS, i)
    ax.set_xticks((0,1,2))         # HERE HERE HERE
    title('Simple ' + str(i))
    if i % COLS == 1:              # left edge
        ax.set_ylabel('voltage (mV)')
    else:
        ax.set_yticklabels ([])
    if i >  NUMPLOTS - COLS:       # nothing below them
        ax.set_xlabel('time (s)')
    else:
        ax.set_xticklabels ([])

savefig('simple_plot')
show()



-- 
Charles R. Twardy                    www.csse.monash.edu.au/~ctwardy
Monash University                    sarbayes.org
Computer Sci. & Software Eng.
+61(3) 9905 5823 (w)  5146 (fax)