On Mon, Apr 18, 2011 at 4:25 AM, Muffles <dantares...@gmail.com> wrote:
>
> Hello all,
> i created some program to read from netcdf files and plot the data, and it
> seems to work ok. But when i try to run an older file, it just shows this:
>
> Traceback (most recent call last):
> File "netcdf2png.py", line 199, in <module>
> savefig("range.png")
> File "/usr/lib/pymodules/python2.6/matplotlib/pyplot.py", line 356, in
> savefig
> return fig.savefig(*args, **kwargs)
> File "/usr/lib/pymodules/python2.6/matplotlib/figure.py", line 1032, in
> savefig
> self.canvas.print_figure(*args, **kwargs)
> File "/usr/lib/pymodules/python2.6/matplotlib/backend_bases.py", line
> 1476, in print_figure
> **kwargs)
> File "/usr/lib/pymodules/python2.6/matplotlib/backends/backend_agg.py",
> line 358, in print_png
> FigureCanvasAgg.draw(self)
> File "/usr/lib/pymodules/python2.6/matplotlib/backends/backend_agg.py",
> line 314, in draw
> self.figure.draw(self.renderer)
> File "/usr/lib/pymodules/python2.6/matplotlib/artist.py", line 46, in
> draw_wrapper
> draw(artist, renderer, *args, **kwargs)
> File "/usr/lib/pymodules/python2.6/matplotlib/figure.py", line 773, in
> draw
> for a in self.axes: a.draw(renderer)
> File "/usr/lib/pymodules/python2.6/matplotlib/artist.py", line 46, in
> draw_wrapper
> draw(artist, renderer, *args, **kwargs)
> File "/usr/lib/pymodules/python2.6/matplotlib/axes.py", line 1735, in draw
> a.draw(renderer)
> File "/usr/lib/pymodules/python2.6/matplotlib/collections.py", line 704,
> in draw
> return Collection.draw(self, renderer)
> File "/usr/lib/pymodules/python2.6/matplotlib/artist.py", line 46, in
> draw_wrapper
> draw(artist, renderer, *args, **kwargs)
> File "/usr/lib/pymodules/python2.6/matplotlib/collections.py", line 201,
> in draw
> self.update_scalarmappable()
> File "/usr/lib/pymodules/python2.6/matplotlib/collections.py", line 477,
> in update_scalarmappable
> self._facecolors = self.to_rgba(self._A, self._alpha)
> File "/usr/lib/pymodules/python2.6/matplotlib/cm.py", line 166, in to_rgba
> x = self.norm(x)
> File "/usr/lib/pymodules/python2.6/matplotlib/colors.py", line 825, in
> __call__
> raise ValueError("minvalue must be less than or equal to maxvalue")
> ValueError: minvalue must be less than or equal to maxvalue
>
> Any ideas?
> Thx in advance
>
My best guess is that there is something messing up the colormap
normalization. Without knowing more about your program and the data being
plotted, I can't say more.
Ben Root
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