Numeric array equivalent of index ?

[Nicolas Pernetty]

Hello,

I'm trying to find a clear and fast equivalent to the index method of
plain python list :

a = [5,1,4,3,4]
a.index(4) 2

I have to use it on a Numeric array, so the best I've come up with is
(rather ugly I think) : from Numeric import array, equal, nonzero
a = array([5,1,4,3,4])
nonzero(equal(a,4))[0]

2
Does someone know of a more Pythonic way ?

Thanks,

[Robert Kern]

Nicolas Pernetty wrote:

Hello,

I'm trying to find a clear and fast equivalent to the index method of
plain python list :

a = [5,1,4,3,4]
a.index(4)
2

I have to use it on a Numeric array, so the best I've come up with is
(rather ugly I think) :
from Numeric import array, equal, nonzero
a = array([5,1,4,3,4])
nonzero(equal(a,4))[0]

2

Does someone know of a more Pythonic way ?

There's a list for Numeric. You'll get better answers there.

http://numeric.scipy.org/

And no, no one has bothered adding a .index() equivalent for general,
unsorted arrays.

--
Robert Kern
rk***@ucsd.edu

"In the fields of hell where the grass grows high
Are the graves of dreams allowed to die."
-- Richard Harter