2011/3/10 Søren Nielsen <soren.skou.niel...@gmail.com>
> Hi,
>
> When I do an errorbar plot (a.errorbar(), a = axis) with negative values
> and then try to change the yscale to log (a.set_yscale('log')) matplotlib
> crashes with:
>
> Traceback (most recent call last):
> File
> "/usr/lib64/python2.6/site-packages/wx-2.8-gtk2-unicode/wx/_core.py", line
> 14636, in <lambda>
> lambda event: event.callable(*event.args, **event.kw) )
> File "/home/specuser/new_workspace/TestDriven/src/RAWPlot.py", line 371,
> in plotSASM
> line, ec, el = a.errorbar(sasm.q[q_min:q_max], sasm.i[q_min:q_max],
> sasm.err[q_min:q_max], picker = 3, label = legend_label, **kwargs)
> File "/usr/lib64/python2.6/site-packages/matplotlib/axes.py", line 4872,
> in errorbar
> barcols.append( self.vlines(x, lower, upper, **lines_kw) )
> File "/usr/lib64/python2.6/site-packages/matplotlib/axes.py", line 3302,
> in vlines
> self.autoscale_view()
> File "/usr/lib64/python2.6/site-packages/matplotlib/axes.py", line 1627,
> in autoscale_view
> YL = self.yaxis.get_major_locator().view_limits(y0, y1)
> File "/usr/lib64/python2.6/site-packages/matplotlib/ticker.py", line
> 1119, in view_limits
> if not is_decade(vmin,self._base): vmin = decade_down(vmin,self._base)
> File "/usr/lib64/python2.6/site-packages/matplotlib/ticker.py", line
> 1030, in is_decade
> return lx==int(lx)
> OverflowError: cannot convert float infinity to integer
> Traceback (most recent call last):
> File
> "/usr/lib64/python2.6/site-packages/wx-2.8-gtk2-unicode/wx/_core.py", line
> 14636, in <lambda>
> lambda event: event.callable(*event.args, **event.kw) )
> File "/home/specuser/new_workspace/TestDriven/src/RAW.py", line 1953, in
> addItem
> newItem = ManipItemPanel(self.underpanel, sasm, font_colour =
> item_colour)
> File "/home/specuser/new_workspace/TestDriven/src/RAW.py", line 2353, in
> __init__
> color = conv.to_rgb(self.sasm.line.get_mfc())
> AttributeError: 'NoneType' object has no attribute 'get_mfc'
>
> I don't think this should be the expected outcome.. rather it should not
> plot values that are illegal/negative (i.e. ignore them).
>
> Is there a way I can get around this without having to search through my
> data and remove points that are negative or NaN or INF when the yscale needs
> to be log? That would also show an incorrect curve since a line would be
> drawn across the points that were removed.. It should rather be gaps in the
> line.
>
> Thanks,
> Soren
>
>
>
>
Soren,
This is a bug I encountered recently in my investigations with log scales.
While most projections are handling this properly, there are some cases
where this problem sneaks in. I have not been able to figure out how to
permanently address this issue.
For reference, the similiar issue is when zooming in on polar plots with the
radial axis in log scale.
Ben Root
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