Equivalent to list.index ?

George Sakkis george.sakkis at gmail.com
Sun Nov 12 14:19:03 CST 2006

Keith Goodman wrote:

> On 11/12/06, George Sakkis <george.sakkis at gmail.com> wrote:
> > This must be pretty trivial but I couldn't find it in the docs: what's
> > the "numpythonic" way to find the (first) index of an element, i.e. the
> > equivalent to list.index ?
> Does where work?

def index(a, value):
    return N.where(a==value)[0][0]

This works but seems clunky and less efficient than necessary. If there
isn't a better alternative, I would welcome a new index()
function/method in the next numpy release.


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