Re: [ferret_users] shuffle or how to permute randomly elements

[Brockmann Patrick <Patrick.Brockmann@xxxxxx>]

Andrew Wittenberg a écrit :
> Hi Patrick,
>
> To shuffle a time series, simply sample your vector with indices that 
> sort
> a random array:
>
>    let a_shuffle = samplel(a,sortl(randu(a)))
>
> An example with multiple shuffles:
>
>    let a = tsequence({100,500,600,20,90,4})
>    let seeds = {101,102,103}
>    let a_shuffle = samplel(a,sortl(randu(tcat(seed,a[l=2:`a,r=lsize`]))))
>    rep/name=s/range=1:`seeds,r=isize` (let seed = seeds[i=`s`]; list 
> a_shuffle)
Nice Andrew.
Thanks very much on this one.

Patrick