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