matplotlib-users

[Matplotlib-users] ticklabels

[Charles <ct...@cs...>]

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)

[Matplotlib-users] ticklabels

[Andrew H. J. <a.h...@gm...>]

Dear all, 

None of the obvious ways for changing ticklabels seem to work for the current version of Matplotlib (1.2.0 for me). At present, ax.yaxis.get_ticklabels().get_text() returns empty strings, as does ax.get_yticklabels(), and the equivalent set_* functions don't seem to have any effect. 

So: help! 

Yours, 

Andrew

Re: [Matplotlib-users] ticklabels

[Goyo <goy...@gm...>]

2013/3/14 Andrew H. Jaffe <a.h...@gm...>:
> Dear all,
>
> None of the obvious ways for changing ticklabels seem to work for the current version of Matplotlib (1.2.0 for me). At present, ax.yaxis.get_ticklabels().get_text() returns empty strings, as does ax.get_yticklabels(), and the equivalent set_* functions don't seem to have any effect.

It seems to be working for me. I'm using a development version but I
don't thing this has changed.

In [1]: import matplotlib.pyplot as plt

In [2]: plt.get_backend()
Out[2]: 'TkAgg'

In [3]: plt.plot([1, 2])
Out[3]: [<matplotlib.lines.Line2D at 0x424c310>]

In [4]: plt.draw()

In [5]: labels = plt.gca().get_yticklabels()

In [6]: map(lambda x: x.get_text(), labels)
Out[6]: [u'1.0', u'1.2', u'1.4', u'1.6', u'1.8', u'2.0', u'2.2', '']

In [7]: plt.gca().set_yticklabels(['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h'])
Out[7]:
[<matplotlib.text.Text at 0x3e97bd0>,
 <matplotlib.text.Text at 0x3ea2390>,
 <matplotlib.text.Text at 0x42bed90>,
 <matplotlib.text.Text at 0x42c0390>,
 <matplotlib.text.Text at 0x42c05d0>,
 <matplotlib.text.Text at 0x42c0c50>,
 <matplotlib.text.Text at 0x42c1310>,
 <matplotlib.text.Text at 0x42c1990>]

In [8]: map(lambda x: x.get_text(), labels)
Out[8]: ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h']

Goyo

Re: [Matplotlib-users] ticklabels

[ChaoYue <cha...@gm...>]

it also works for me for 1.2.0
In [1]: mat.__version__
Out[1]: '1.2.0'

In [2]: plot(np.arange(5),'ro')
Out[2]: [<matplotlib.lines.Line2D at 0xc88262c>]

In [3]: ax = gca()

In [4]: ax.set_xticklabels('abcdefghij')
Out[4]: 
[<matplotlib.text.Text at 0xbbb048c>,
 <matplotlib.text.Text at 0xbbb0c8c>,
 <matplotlib.text.Text at 0xc88780c>,
 <matplotlib.text.Text at 0xc887e2c>,
 <matplotlib.text.Text at 0xc88b4cc>,
 <matplotlib.text.Text at 0xc88bb4c>,
 <matplotlib.text.Text at 0xc8911ec>,
 <matplotlib.text.Text at 0xc89186c>,
 <matplotlib.text.Text at 0xc891eec>]

In [5]: [t.get_text() for t in ax.get_xticklabels()]
Out[5]: ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i']





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Re: [Matplotlib-users] ticklabels

[John H. <jdh...@ac...>]

>>>>> "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

Re: [Matplotlib-users] ticklabels

[Charles <ct...@cs...>]

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)