Re: [Matplotlib-users] type error with python 3.2 and version 1.1.1 of matplotlib (numpy error)

[Eric F. <ef...@ha...>]

On 2012/09/05 4:04 PM, Paul Tremblay wrote:
> I am using numpy 1.7, which I built myself (python3 setup.py build). I
> had a chance to look a bit deeper into matplotlib, which in turn forced
> me to learn a bit of numpy, and now I see that it probably makes more
> sense to use numpy arrays for my data. Since the default for an array is
> a float, most users won't encounter the problems I did, but a warning in
> a FAQ might solve a few headaches, regardless of how the developers
> decided to go.

Paul,

numpy 1.7 has a new datetime dtype which probably would be good for your 
use--except that mpl doesn't support it yet.  That will be a project for 
mpl v1.3.

Eric

>
> Thanks for your help.
>
> Paul
>
> On Tue, Sep 4, 2012 at 3:09 PM, Benjamin Root <ben...@ou...
> <mailto:ben...@ou...>> wrote:
>
>
>
>     On Tue, Sep 4, 2012 at 2:20 PM, Paul Tremblay
>     <pau...@gm... <mailto:pau...@gm...>> wrote:
>
>
>         The following Python code:
>
>          >>ax.fill_between(dates, lower, upper, facecolor='gray', alpha=0.5)
>
>         Produces this error with Python 3.2:
>
>         Traceback (most recent call last):
>            File "scripts/audit_reports_weekly.py", line 150, in <module>
>              ax.fill_between(dates, lower, upper, facecolor='gray',
>         alpha=0.5)
>            File
>         "/home/local/ANT/ptrembl/.local/lib/python3.2/site-packages/matplotlib/axes.py",
>         line 6741, in fill_between
>              y1 = ma.masked_invalid(self.convert_yunits(y1))
>            File
>         "/home/local/ANT/ptrembl/.local/lib/python3.2/site-packages/numpy/ma/core.py",
>         line 2241, in masked_invalid
>              condition = ~(np.isfinite(a))
>         TypeError: ufunc 'isfinite' not supported for the input types,
>         and the inputs could not be safely coerced to any supported
>         types according to the casting rule ''safe''
>
>
>         [Decimal('3619.900530366609820157812617'), .....]
>
>         If I change the list from type Decimal to type float, then I
>         don't get the error. Likewise, if I use Python 2.7, I also don't
>         get an error.
>
>         After reading over the error message, I realize that this error
>         really results because of numpy, not matplotlib. But I'll go
>         ahead and post this message, in case you are unaware of the
>         problem.
>
>
>     Just a quick note, mpl v1.1.x is not officially supported for py3k.
>     The upcoming release of v1.2.0 will be the first official release
>     with such support.
>
>     That being said, it probably would be a good idea to make sure where
>     the bug lies for this one (numpy or matplotlib).  Which version of
>     numpy are you using?
>
>     Ben Root
>
>
>
>
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