[Numpy-discussion] weighted random integers

Charles R Harris charlesr.harris@gmail....
Fri Sep 10 19:15:16 CDT 2010


On Fri, Sep 10, 2010 at 5:46 PM, <josef.pktd@gmail.com> wrote:

> I saw some questions on the web how to create non-uniform random
> integers in python.
>
> I don't know what the best way is but here is another way that looks
> reasonably fast
>
> >>> rvs = np.dot(np.random.multinomial(1, [0.1, 0.2, 0.5, 0.2],
> size=1000000),np.arange(4))
>
> >>> np.bincount(rvs)/1000000.
> array([ 0.099741,  0.199943,  0.499317,  0.200999])
>
>
This looks like a good case for the inverse cdf approach, at least for
smallish ranges of integers. Searchsorted on an array of appropriate values
should do the trick.

Chuck
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