On Friday 16 January 2009, Eric Firing wrote: > Neal Becker wrote: > > pylab.plot (xaxis, log10 (the_sum)*10) > > where xaxis is numpy array, and log10(the_sum)*10 is my own class that is > > a valid python sequence (it is a c++ wrapper around boost::ublas), gives: > > File "/usr/lib/python2.5/site-packages/matplotlib-0.98.5.2-py2.5-linux- > > x86_64.egg/matplotlib/pyplot.py", line 2096, in plot > > ret = gca().plot(*args, **kwargs) > > File "/usr/lib/python2.5/site-packages/matplotlib-0.98.5.2-py2.5-linux- > > x86_64.egg/matplotlib/axes.py", line 3277, in plot > > for line in self._get_lines(*args, **kwargs): > > File "/usr/lib/python2.5/site-packages/matplotlib-0.98.5.2-py2.5-linux- > > x86_64.egg/matplotlib/axes.py", line 394, in _grab_next_args > > for seg in self._plot_2_args(remaining, **kwargs): > > File "/usr/lib/python2.5/site-packages/matplotlib-0.98.5.2-py2.5-linux- > > x86_64.egg/matplotlib/axes.py", line 267, in _plot_2_args > > if is_string_like(tup2[1]): > > File "/usr/lib/python2.5/site-packages/matplotlib-0.98.5.2-py2.5-linux- > > x86_64.egg/matplotlib/cbook.py", line 277, in is_string_like > > try: obj + '' > > RuntimeError: check:: failed > > > > If I convert the 2nd arg to array, it works: > > pylab.plot (xaxis, np.array(log10 (the_sum)*10)) > > > > Doesn't plot support arbitrary sequences? > > Not *completely* arbitrary, evidently. It has to raise a Python > exception when an invalid operation (specifically, adding an empty > string) is attempted. Apparently your wrapper is not doing this. This > is the duck-typing check for a string that mpl has used from early times. > > Eric Is it possible that this could be better? I'm not sure what's happening here, but I think it is trying to see if my type can be a string first. It can, but that's not a good idea in this case. It should correctly support a sequence (and iterator) protocol. Shouldn't matplotlib try that first?
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