[Numpy-discussion] numpy putmask() method and a scalar.

[Christopher B. <Chr...@no...>]

Hi all,

I was just trying to use the putmask() method to replace a bunch of 
values with the same value and got and error, where the putmask() 
function works fine:

 >>> import numpy as N
 >>> a = N.arange(5)
 >>> a
array([0, 1, 2, 3, 4])
 >>> a.putmask(a > 3, 3)
Traceback (most recent call last):
   File "<stdin>", line 1, in ?
ValueError: putmask: mask and data must be the same size

 >>> N.putmask(a, a > 3, 3)
 >>> a
array([0, 1, 2, 3, 3])

and:

 >>> help (N.ndarray.putmask)
putmask(...)
     a.putmask(values, mask) sets a.flat[n] = v[n] for each n where 
mask.flat[n] is TRUE. v can be scalar.

indicates that it should work.

-Chris


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Christopher Barker, Ph.D.
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Chr...@no...