I noticed in your output that another figure seems to have been created
(you see its output as "<matplotlib.figure.Figure at 0x1354cb70>"). It
would be useful to add some print statements to figure out exactly which
line is emitting that. Second, you are calling "plt.savefig()" in the
for-loop for the same filename. I suspect that isn't what you want. I am
going to assume that you want to save a final figure after the for-loop is
complete, right?
Also, it would be more clear to use "fig.savefig()" instead of the more
"magical" plt.savefig() as the latter would automatically create a figure
if one didn't exist for some reason.
Ben Root
On Sat, May 16, 2015 at 11:57 AM, Thomas Caswell <tcasw...@gmail.com> wrote:
> This is coming out of the pandas plotting tools, you might get better
> answers on their mailing list.
>
> Tom
>
> On Sat, May 16, 2015 at 11:51 AM Juan Wu <wujua...@gmail.com> wrote:
>
>> Hi, List experts,
>>
>> I have a matplotlib problem when I tried to use a tool called HDDM. As
>> HDDM is another issue, I here just post my problem with Matplotlib. In
>> short, the error alarm appeard when I input fig = plt.figure(). I am a
>> beginner with those stuff.
>>
>> I would appreciate if anyone can give me any good pointers.
>>
>> Thanks so much,
>> Juan
>>
>> ==================
>>
>> In [8]: fig = plt.figure()
>> <matplotlib.figure.Figure at 0x13293890>
>>
>> In [9]: ax = fig.add_subplot(111, xlabel='RT', ylabel='count',
>> title='RT distributions')
>>
>> In [10]: for i, subj_data in data.groupby('subj_idx'):
>> ...: subj_data.rt.hist(bins=20, histtype='step', ax=ax)
>> ...: plt.savefig('hddm_demo_fig_00.pdf')
>>
>> <matplotlib.figure.Figure at 0x1354cb70>
>> Traceback (most recent call last):
>>
>> File "<ipython-input-15-3b0b3c83094c>", line 2, in <module>
>> subj_data.rt.hist(bins=20, histtype='step', ax=ax)
>>
>> File "C:\Anaconda\lib\site-packages\pandas\tools\plotting.py", line
>> 2830, in hist_series
>> raise AssertionError('passed axis not bound to passed figure')
>>
>> AssertionError: passed axis not bound to passed figure
>>
>> (relevant link:
>> https://groups.google.com/forum/#!topic/hddm-users/yBeIRJaHGwo
>> there very few experts view and reply questions)
>>
>>
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>
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