Error when adding matrix in the X-axis

[bestmoon]

using the matplotlib 1.3.1, the error message:

File "bar-chart.py", line 68, in plot
    plt.tight_layout()
  File "/usr/local/lib/python2.7/dist-packages/matplotlib-1.3.1-py2.7-linux-x86_64.egg/matplotlib/pyplot.py", line 1255, in tight_layout
    fig.tight_layout(pad=pad, h_pad=h_pad, w_pad=w_pad, rect=rect)
  File "/usr/local/lib/python2.7/dist-packages/matplotlib-1.3.1-py2.7-linux-x86_64.egg/matplotlib/figure.py", line 1607, in tight_layout
    self.subplots_adjust(**kwargs)
  File "/usr/local/lib/python2.7/dist-packages/matplotlib-1.3.1-py2.7-linux-x86_64.egg/matplotlib/figure.py", line 1467, in subplots_adjust
    self.subplotpars.update(*args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/matplotlib-1.3.1-py2.7-linux-x86_64.egg/matplotlib/figure.py", line 217, in update
    raise ValueError('left cannot be >= right')
ValueError: left cannot be >= right

The source code is

ind_label = [
    r'$ \left(\begin{array}{ccc} a & b & c \\ d & e & f \\ g & h & i \end{array} \right) $',
    r'$ \left(\begin{array}{ccc} a & b & c \\ d & e & f \\ g & h & i \end{array} \right)$',
    r'$ \left(\begin{array}{ccc} a & b & c \\ d & e & f \\ g & h & i \end{array} \right)$',
    r'$ \left(\begin{array}{ccc} a & b & c \\ d & e & f \\ g & h & i \end{array} \right)$',
    r'$ \left(\begin{array}{ccc} a & b & c \\ d & e & f \\ g & h & i \end{array} \right)$',
    r'$ \left(\begin{array}{ccc} a & b & c \\ d & e & f \\ g & h & i \end{array} \right)$'
    ]

Thanks a lot for your help.

[efiring]

Please provide a minimal but complete, standalone example that triggers the error. It looks to me like it is not directly related to the ind_label array of strings that you show.

[bestmoon]

The code follows. It should be runnable.

---

#!/bin/python

import sys
import numpy as np
import math
import decimal 
import matplotlib.pyplot as plt
import matplotlib.mlab as mlab 
from matplotlib import rcParams

def plot():

    rcParams['text.usetex'] = True

    N = 6
    ind = np.arange(N)
    ind_label = [
    r'$ \left(\begin{array}{ccc} a & b & c \\ d & e & f \\ g & h & i \end{array} \right) $',
    r'$ \left(\begin{array}{ccc} a & b & c \\ d & e & f \\ g & h & i \end{array} \right)$',
    r'$ \left(\begin{array}{ccc} a & b & c \\ d & e & f \\ g & h & i \end{array} \right)$',
    r'$ \left(\begin{array}{ccc} a & b & c \\ d & e & f \\ g & h & i \end{array} \right)$',
    r'$ \left(\begin{array}{ccc} a & b & c \\ d & e & f \\ g & h & i \end{array} \right)$',
    r'$ \left(\begin{array}{ccc} a & b & c \\ d & e & f \\ g & h & i \end{array} \right)$'
    ]

    y = [1.60, 1.65, 1.70, 1.75, 1.80]
    n_b = [1.747, 1.747, 1.747, 1.746, 1.746, 1.746]
    b_n = [1.746, 1.737, 1.742, 1.783, 1.780, 1.790]
    svm = [1.689, 1.694, 1.702, 1.639, 1.634, 1.628]

    width = 0.2

    fig = plt.figure()
    ax = fig.add_subplot(111)

    rec_nb  = ax.bar(ind, n_b, width, color='c', align='center')
    rec_bn  = ax.bar(ind+width, b_n, width, color='y', align='center')
    rec_svm = ax.bar(ind+width*2, svm, width, color='b', align='center')

    ax.set_ylabel('Value',fontsize=20)
    ax.set_xlabel('Matrix', fontsize=20)
    ax.tick_params(axis='both', labelsize=17)
    ax.set_xticks(ind+width)
    ax.set_xticklabels(ind_label, fontsize=18)
    ax.axis([-0.2, 5.6, 1.58, 1.82])

    ax.legend((rec_nb[0],rec_bn[0],rec_svm[0]),('method 1','method 2','method 3'), loc="upper right",shadow=True)

    plt.grid()
    plt.tight_layout()
    plt.show()


if __name__ == '__main__':
    plot()

---

The expected output is:

The error is reproducible on my host.
The message says:

Traceback (most recent call last):
  File "bar-example.py", line 55, in <module>
    plot()
  File "bar-example.py", line 50, in plot
    plt.tight_layout()
  File "/usr/local/lib/python2.7/dist-packages/matplotlib/pyplot.py", line 1288, in tight_layout
    fig.tight_layout(pad=pad, h_pad=h_pad, w_pad=w_pad, rect=rect)
  File "/usr/local/lib/python2.7/dist-packages/matplotlib/figure.py", line 1665, in tight_layout
    self.subplots_adjust(**kwargs)
  File "/usr/local/lib/python2.7/dist-packages/matplotlib/figure.py", line 1522, in subplots_adjust
    self.subplotpars.update(*args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/matplotlib/figure.py", line 221, in update
    raise ValueError('left cannot be >= right')

---

Thanks a lot for your time and help.

[efiring]

I can't reproduce it on either 1.3.1 or on master; I get exactly your expected output, with no Exception being raised. Maybe you have a custom matplotlibrc, and the difference is in an rcParams setting? Does it work for you if you comment out the tight_layout call?

[bestmoon]

Then, it is so wired. I use pip and easy_install to install the matplotlib. Both give me this type of error.

As you suggested, I comment out the tight_layout(). And, the figure was plotted without labelings on x-axis and y-axis.
The error messgae says:

$ python bar-example.py
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/matplotlib/backends/backend_qt5.py", line 338, in resizeEvent
    self.draw()
  File "/usr/local/lib/python2.7/dist-packages/matplotlib/backends/backend_qt5agg.py", line 148, in draw
    FigureCanvasAgg.draw(self)
  File "/usr/local/lib/python2.7/dist-packages/matplotlib/backends/backend_agg.py", line 469, in draw
    self.figure.draw(self.renderer)
  File "/usr/local/lib/python2.7/dist-packages/matplotlib/artist.py", line 59, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/matplotlib/figure.py", line 1085, in draw
    func(*args)
  File "/usr/local/lib/python2.7/dist-packages/matplotlib/artist.py", line 59, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/matplotlib/axes/_base.py", line 2110, in draw
    a.draw(renderer)
  File "/usr/local/lib/python2.7/dist-packages/matplotlib/artist.py", line 59, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/matplotlib/axis.py", line 1128, in draw
    self.label.draw(renderer)
  File "/usr/local/lib/python2.7/dist-packages/matplotlib/artist.py", line 59, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/matplotlib/text.py", line 638, in draw
    self._fontproperties, angle, mtext=mtext)
  File "/usr/local/lib/python2.7/dist-packages/matplotlib/backends/backend_agg.py", line 259, in draw_tex
    self._renderer.draw_text_image(Z, x, y, angle, gc)
ValueError: cannot convert float NaN to integer

Does that mean something?
Thanks a lot for your prompt reply.

[efiring]

So even without tight_layout, you are getting an obscure error. I am wondering whether the problem is in your latex installation. Can you run the usetex_demo.py? http://matplotlib.org/examples/pylab_examples/usetex_demo.html

[bestmoon]

Actually, I have no problem to run the usetex_demo.py code.
The result matches the provided one. There is no error.

And, as you suggested, I am also doubt the problem is in the latex installation.
I reinstalled it using the following scripts.

sudo apt-get update
sudo apt-get install texlive-full
sudo apt-get install gedit-latex-plugin texlive-fonts-recommended latex-beamer texpower texlive-pictures texlive-latex-extra

The problem is still there :(
Anyway, I found a clean host and reinstalled matplotlib. It works well as I expected.

Thanks a lot for all your help.

[efiring]

Glad you solved the problem.