[Scilab-users] row-sum of a hyper-matrix without loop

[Samuel Gougeon]

Le 24/11/2019 à 20:01, Samuel Gougeon a écrit :
> Le 24/11/2019 à 19:53, fujimoto2005 a écrit :
>> Is it posible to get a 2-dimension matrix y(j,k) =Σ_i x(i,j,k) from 3
>> dimension hyper- matrix x(i,j,k) without using  k-loop?
>> If there is such a way, please teach me.
>
> --> h = grand(4,3,2,"uin",0,3)
>  h  =
> (:,:,1)
>    0.   0.   2.
>    2.   3.   3.
>    2.   1.   3.
>    1.   1.   1.
> (:,:,2)
>    0.   3.   1.
>    2.   0.   1.
>    3.   1.   3.
>    0.   2.   3.
>
> --> matrix(sum(h,1),-1,size(h,2))
>  ans  =
>    5.   9.   6.
>    5.   5.   8.
>

Sorry, the correct algorithm is

--> h = grand(4,3,2,"uin",0,3)

  h  =
(:,:,1)
    2.   0.   1.
    2.   3.   2.
    0.   0.   2.
    1.   1.   3.
(:,:,2)
    1.   0.   1.
    1.   2.   0.
    3.   3.   1.
    0.   0.   2.

--> matrix(sum(h,1),size(h,2), -1)
  ans  =
    5.   5.
    4.   5.
    8.   4.

Samuel


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