Axis missing in matplotlib

Question

I have been having a problem with python and matplotlib I am running

from matplotlib import rc
import matplotlib.cm as cm
from matplotlib.ticker import MultipleLocator


scoreArray = [3,8,7,8,9,0]
scoreArrayIsopmap = [3,4,7,1,3,0]
scoreArrayPCA = [0,1,7,6,3,15]

rc('font',**{'family':'Bitstream Vera Sans','serif': ['Palatino']})
rc('text', usetex=True)

fig, (ax1) = plt.subplots(1,1, figsize=(7,5))

ax1.plot(range(0,6), scoreArray, color = 'b', ls='-', lw=4, alpha=0.7, label="A Priori Manifold")
ax1.plot(range(0,6), scoreArrayIsopmap, color = 'r', ls='-', lw=4, alpha=0.7, label="Isomap")
ax1.plot(range(0,6), scoreArrayPCA, color = 'g', ls='-', lw=4, alpha=0.7, label="PCA")

ax1.xaxis.set_major_locator(MultipleLocator(10))
ax1.grid(which='major', axis='x', linewidth=0.25, linestyle='-', color='0.75') 
ax1.grid(True) 
ax1.set_ylabel('Dunn Index') 
ax1.set_xlabel('Number Of Components')

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)

1419             self.set_frameon(frameon)
1420 
-> 1421         self.canvas.print_figure(*args, **kwargs)
1422 
1423         if frameon:

/usr/local/lib/python2.7/site-packages/matplotlib/backend_bases.pyc in print_figure(self,    filename, dpi, facecolor, edgecolor, orientation, format, **kwargs)
2218                 orientation=orientation,
2219                 bbox_inches_restore=_bbox_inches_restore,
-> 2220                 **kwargs)
2221         finally:
2222             if bbox_inches and restore_bbox:

/usr/local/lib/python2.7/site-packages/matplotlib/backend_bases.pyc in print_pdf(self, *args, **kwargs)
1950         from backends.backend_pdf import FigureCanvasPdf  # lazy import
1951         pdf = self.switch_backends(FigureCanvasPdf)
-> 1952         return pdf.print_pdf(*args, **kwargs)
1953 
1954     def print_pgf(self, *args, **kwargs):

/usr/local/lib/python2.7/site-packages/matplotlib/backends/backend_pdf.pyc in print_pdf(self, filename, **kwargs)
2338                                          width, height, image_dpi, RendererPdf(file, image_dpi),
2339                                          bbox_inches_restore=_bbox_inches_restore)
-> 2340             self.figure.draw(renderer)
2341             renderer.finalize()
2342         finally:

/usr/local/lib/python2.7/site-packages/matplotlib/artist.pyc in draw_wrapper(artist, renderer, *args, **kwargs)
52     def draw_wrapper(artist, renderer, *args, **kwargs):
53         before(artist, renderer)
---> 54         draw(artist, renderer, *args, **kwargs)
55         after(artist, renderer)
56 

/usr/local/lib/python2.7/site-packages/matplotlib/figure.pyc in draw(self, renderer)
1032         dsu.sort(key=itemgetter(0))
1033         for zorder, a, func, args in dsu:
-> 1034             func(*args)
1035 
1036         renderer.close_group('figure')

/usr/local/lib/python2.7/site-packages/matplotlib/artist.pyc in draw_wrapper(artist, renderer, *args, **kwargs)
52     def draw_wrapper(artist, renderer, *args, **kwargs):
53         before(artist, renderer)
---> 54         draw(artist, renderer, *args, **kwargs)
55         after(artist, renderer)
56 

/usr/local/lib/python2.7/site-packages/matplotlib/axes.pyc in draw(self, renderer, inframe)
2084 
2085         for zorder, a in dsu:
-> 2086             a.draw(renderer)
2087 
2088         renderer.close_group('axes')

/usr/local/lib/python2.7/site-packages/matplotlib/artist.pyc in draw_wrapper(artist, renderer, *args, **kwargs)
52     def draw_wrapper(artist, renderer, *args, **kwargs):
53         before(artist, renderer)
---> 54         draw(artist, renderer, *args, **kwargs)
55         after(artist, renderer)
56 

/usr/local/lib/python2.7/site-packages/matplotlib/axis.pyc in draw(self, renderer, *args, **kwargs)
1087         ticks_to_draw = self._update_ticks(renderer)
1088         ticklabelBoxes, ticklabelBoxes2 = self._get_tick_bboxes(ticks_to_draw,
-> 1089                                                                 renderer)
1090 
1091         for tick in ticks_to_draw:

/usr/local/lib/python2.7/site-packages/matplotlib/axis.pyc in _get_tick_bboxes(self, ticks, renderer)
1036         for tick in ticks:
1037             if tick.label1On and tick.label1.get_visible():
-> 1038                 extent = tick.label1.get_window_extent(renderer)
1039                 ticklabelBoxes.append(extent)
1040             if tick.label2On and tick.label2.get_visible():

/usr/local/lib/python2.7/site-packages/matplotlib/text.pyc in get_window_extent(self, renderer, dpi)
751             raise RuntimeError('Cannot get window extent w/o renderer')
752 
--> 753         bbox, info, descent = self._get_layout(self._renderer)
754         x, y = self.get_position()
755         x, y = self.get_transform().transform_point((x, y))

/usr/local/lib/python2.7/site-packages/matplotlib/text.pyc in _get_layout(self, renderer)
318         tmp, lp_h, lp_bl = get_text_width_height_descent('lp',
319                                                          self._fontproperties,
--> 320                                                          ismath=False)
321         offsety = (lp_h - lp_bl) * self._linespacing
322 

/usr/local/lib/python2.7/site-packages/matplotlib/backends/backend_pdf.pyc in    get_text_width_height_descent(self, s, prop, ismath)
1945     def get_text_width_height_descent(self, s, prop, ismath):
1946         if rcParams['text.usetex']:
-> 1947             texmanager = self.get_texmanager()
1948             fontsize = prop.get_size_in_points()
1949             w, h, d = texmanager.get_text_width_height_descent(s, fontsize,

/usr/local/lib/python2.7/site-packages/matplotlib/backend_bases.pyc in get_texmanager(self)
612         if self._texmanager is None:
613             from matplotlib.texmanager import TexManager
--> 614             self._texmanager = TexManager()
615         return self._texmanager
616 

/usr/local/lib/python2.7/site-packages/matplotlib/texmanager.pyc in __init__(self)
170         if len(ff) == 1 and ff[0].lower() in self.font_families:
171             self.font_family = ff[0].lower()
--> 172         elif ff.lower() in self.font_families:
173             self.font_family = ff.lower()
174         else:

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

I get the image above but the axis are not visible. I run python 2.7.5 and matplotlib 1.3. I work on a mac and it works fine on a different mac. It was working fine on mine until 2 days ago.

Anyone has any idea why this happens?

Answer 1

There are two things here:

1. From the matplotlib code:

   font.family must be one of (serif, sans-serif, cursive, monospace) when text.usetex is True. serif will be used by default.

   So if you use the text.usetex you should set the font.family to be one of the supported values.

2. You found a bug in the matplotlib 1.3.0 :) But it's already fixed on the development branch. So in the next release you won't get the error.