[Numpy-discussion] Fwd: Getting subarray

Gael Varoquaux gael.varoquaux@normalesup....
Mon Apr 23 10:49:51 CDT 2007


On Mon, Apr 23, 2007 at 11:44:08AM -0400, Steve Lianoglou wrote:
> > I have two arrays:

> > a = numpy.array([0,1,2,3,4,5,6,7,8,9])
> > b = numpy.array([0,0,1,1,2,2,0,1,2,3])

> > I would like to get the part of a that corresponds
> > to where b is equal to i.

> > For example:

> > i = 0 => ([0,1,6])
> > i = 1 => ([2,3,7])

> a[numpy.where(b == 0)]

> and

> a[numpy.where(b == 1)]

How about "a[ b==0 ]" and "a[ b==1 ]" ?

Gaël


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