RE: [Matplotlib-users] Two questions

[Perry G. <pe...@st...>]

> >>>>> "Kenneth" == Kenneth McDonald <kmm...@wi...> writes:
>
>     Kenneth> 1) (Simple) Is there a defined behavior for matplotlib
>     Kenneth> when it attempts to graph data containing NaN values?
>     Kenneth> (OK, I admit-- it's really, really late, and I have tried
>     Kenneth> it to see what happens.  But even that wouldn't tell me
>     Kenneth> if that was the _defined_ behavior :-))
>
I guess the question I have is what would you expect to happen?
My impression is that different people want to treat "missing"
data different ways. I'd say it should be a mistake to try to
plot NaNs. But taking the concept further, and generalizing
these to missing values, I'd be open to plotting functions
that accept masks if there was a common consensus as to what
those functions should do with those masks.

> No, it's not defined.  I don't know that NaN is defined across
> platforms in python.  See my recent question on comp.lang.python
>
> http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&oe=UTF-8&thread
m=mailman.141.1080681106.20120.python-list%40python.org&rnum=3&prev=/groups%
> 3Fq%3Dtest%2Bnan%2Bgroup%253A*python*%26ie%3DUTF-8%26oe%3DUTF-8%26
> hl%3Den%26btnG%3DGoogle%2BSearch
>
> Perhaps Todd or Perry can comment on what the status of NaN vis-a-vis
> Numeric and numarray.  This has come up a number of times before, and
> would be nice to be able to handle it.  As always, these ease of use
> features imply a performance cost that the typical user may not want
> to pay....
>
Todd has already explained that numarray can easily generate masks
from NaNs or other ieee special values.
>