[Numpy-discussion] iteration over arrays

Chris Fenton chrisf at fagmed.uit.no
Mon Apr 28 03:31:03 CDT 2003


INTRO:
I am trying to use Jnumeric(jython numeric)for mixed arrays of int, 
NONE, string, and  user defined objects, mostly because of the easy to 
use syntax and notation.

QUESTION:
Is there an easy way to generate a mask array from object type ?
pseudocode:
vector = array(['a',2,'b',None,None,None,'hello'])
 >>> ['a',2,'b',None,None,None,'hello']
mask   = equal(vector, isString)
 >>> [1,0,1,0,0,0,1]

EXAMPLE:

vector = array([1,2,3,None,None,None,7])
 >>>[1,2,3,None,None,None,7]
mask   = equal(vector, None).astype(Int8)
 >>>[0,0,0,1,1,1,0]

PS:

Why don't we have a boolean-(0,1)-1bit type ?


Chris Fenton










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