[Scilab-users] Problem with Matrix operation

[Samuel Gougeon]

Le 25/04/2017 à 15:29, SCHULZ Wolfgang a écrit :
> Hello,
> I want to set certain elements of a matrix to 1. Interestingly the following code fills 9 elements with 1. I expected to have only 3 elements (with index 1,1; 2,2 and 3,3) filled with 1.
>
> A=zeros(5,3)
> inx=[1 2 3];
> iny=[1 2 3];
> A(inx,iny)=1
>
> Is there any way to fill a matrix with 1 where I have the indexes in 2 vectors?

A  =  zeros(5,3)
inx= [1  2  3];
iny= [1  2  3];
A(sub2ind(size(A),inx,iny))= 1 --> A(sub2ind(size(A),inx,iny)) = 1A = 1. 
0. 0.0. 1. 0.0. 0. 1.0. 0. 0.0. 0. 0.

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