Neal Becker wrote: > 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? > No, it really needs to find out if it is a string, and a string is iterable, so a string-specific check is needed.
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