Re: [matplotlib-devel] New backend API

[Darren D. <dd...@co...>]

On Monday 20 March 2006 13:40, Andrew Straw wrote:
> Darren Dale wrote:
> >Here's a bug: I need isnan to create my mask. It is provided by numerix
> > with numpy and numarray, but not Numeric. Can this be rectified?
>
> I just added the matplotlib._isnan extension module which is independent
> of the numerix choice (although I think it'll be better to stick with a
> numerix-given function, if available). Below is an example of its use.
> Perhaps you can modify the Numeric-flavor numerix so that isnan is
> exposed the same way as numarray and numpy -- I didn't do this because
> you'll be more familiar with the details than I am.
>
> #Example:
> import matplotlib._isnan as n
> import numpy
>
> for val in [3.2,3,numpy.nan,'adsf']:
>     print 'val',val
>     print n.isnan64(val)
>     print

Thank you, Andrew (Baker's Dozen) Straw.

Does this look about right?

def isnan(a):
    return reshape(array([isnan64(i) for i in ravel(a)],'b'), shape(a))

In [1]: a=ones((3,3,3),'d')

In [2]: a[0,0,0]=array(0.0)/0

In [3]: isnan(a)
Out[3]:
[[[1,0,0,]
  [0,0,0,]
  [0,0,0,]]
 [[0,0,0,]
  [0,0,0,]
  [0,0,0,]]
 [[0,0,0,]
  [0,0,0,]
  [0,0,0,]]]