[Numpy-discussion] For loop tips

Torgil Svensson torgil.svensson at gmail.com
Thu Aug 31 13:25:12 CDT 2006


def list2index(L):
    uL=sorted(set(L))
    idx=dict((y,x) for x,y in enumerate(uL))
    return uL,asmatrix(fromiter((idx[x] for x in L),dtype=int,count=len(L)))

adding the count will save you a little more time, and temporary
memory [see related thread].

//Torgil

On 8/29/06, Keith Goodman <kwgoodman at gmail.com> wrote:
> On 8/29/06, Torgil Svensson <torgil.svensson at gmail.com> wrote:
> > something like this?
> >
> > def list2index(L):
> >    uL=sorted(set(L))
> >    idx=dict((y,x) for x,y in enumerate(uL))
> >    return uL,asmatrix(fromiter((idx[x] for x in L),dtype=int))
>
> Wow. That's amazing. Thank you.
>
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