#4468: assertion error when (some) bad color map given
----------------------+-----------------------------------------------------
Reporter: slabbe | Owner: slabbe
Type: defect | Status: new
Priority: major | Milestone: sage-3.2.1
Component: graphics | Keywords: cmap
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The following example works well :
{{{
sage: matrix_plot(random_matrix(RDF, 50), cmap='hsv')
}}}
But the next one doesn't which is fine because 'jolies' doesn't correspond
to a color map.
{{{
sage: matrix_plot(random_matrix(RDF, 50), cmap='jolies')
verbose 0 (2212: plot.py, _render_on_subplot) The possible color maps
include: Spectral, summer, pink_r, Set1, Set2, Set3, Dark2, prism, PuOr_r,
PuBuGn_r, RdPu, gist_ncar_r, Dark2_r, YlGnBu, RdYlBu, hot_r,
gist_rainbow_r, gist_stern, cool_r, cool, gray, copper_r, Greens_r, GnBu,
gist_ncar, spring_r, gist_rainbow, gist_heat_r, summer_r, OrRd_r, bone,
gist_stern_r, RdYlGn, Pastel2_r, spring, Accent, YlOrRd_r, Set2_r, PuBu,
RdGy_r, spectral, flag_r, jet_r, RdPu_r, gist_yarg, BuGn, Paired_r, hsv_r,
YlOrRd, Greens, PRGn, gist_heat, spectral_r, Paired, hsv, Oranges_r,
prism_r, Pastel2, Pastel1_r, Pastel1, gray_r, PuRd_r, Spectral_r, BuPu,
YlGnBu_r, copper, gist_earth_r, Set3_r, OrRd, PuBu_r, winter_r, RdBu, jet,
bone_r, gist_earth, Oranges, RdYlGn_r, PiYG, YlGn, binary_r, gist_gray_r,
gist_gray, flag, RdBu_r, BrBG, Reds, GnBu_r, BrBG_r, Reds_r, RdGy, PuRd,
Accent_r, Blues, Greys, autumn, PRGn_r, Greys_r, pink, binary, winter,
gist_yarg_r, RdYlBu_r, hot, YlOrBr, BuPu_r, Purples_r, PiYG_r, YlGn_r,
Blues_r, YlOrBr_r, Purples, autumn_r, BuGn_r, Set1_r, PuOr, PuBuGn
---------------------------------------------------------------------------
RuntimeError Traceback (most recent call
last):
...
RuntimeError: Color map jolies not known
}}}
What about 'mpl' which as well doesn't correspond to a color map :
{{{
sage: matrix_plot(random_matrix(RDF, 50), cmap='mpl')
---------------------------------------------------------------------------
AssertionError Traceback (most recent call
last):
...
AssertionError:
}}}
An assertion error : why ? Because in plot.py, we test only if the given
cmap is a key of a certain dictionary but not *all* the key of this
dictionary correspond to a color map. In fact, there are 18 exceptions as
shown below.
{{{
sage: from matplotlib import cm
sage: d = cm.__dict__
sage: from matplotlib.colors import LinearSegmentedColormap as C
sage: 'mpl' in [x for x in d.keys() if not isinstance(d[x], C)]
True
sage: [x for x in d.keys() if not isinstance(d[x], C)]
['colors',
'cmapname_r',
'ScalarMappable',
'LUTSIZE',
'cmapname',
'cbook',
'__file__',
'cmapnames',
'cmapdat_r',
'__builtins__',
'__name__',
'get_cmap',
'__doc__',
'revcmap',
'ma',
'np',
'mpl',
'datad']
sage: len(_)
18
}}}
a patch to come...
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/4468>
Sage <http://sagemath.org/>
Sage - Open Source Mathematical Software: Building the Car Instead of
Reinventing the Wheel
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