[Scilab-users] range of colon

[Samuel Gougeon]

Le 14/01/2020 à 22:40, Federico Miyara a écrit :
>
> Dear all,
>
> I need to zero-pad the columns of an N-D array x to a length N. I've 
> found the following solution:
>
> siz = size(x);
> a = repmat(0,[N, siz(2:$)]);     // Create array of 0's whose columns 
> have length N
>                                  // and the remaining dimensions are 
> the same as in x
> a(1:siz(1), :) = x;              // Replace non-padding 0's by x
>
>
> This seems to work. 

Really?:

--> x = rand(3,4,2);
--> N= 5;
--> siz = size(x);
--> a = repmat(0,[N, siz(2:$)]);     // Create array of 0's whose 
columns have length N
--> a(1:siz(1), :) = x

Submatrix incorrectly defined.

Why not using resize_matrix()?

s = size(a);
x = resize_matrix(x,[N, s(2:$)]);

--> resize_matrix(x,[N s(2:$)])
  ans  =
(:,:,1)
    0.3616361   0.4826472   0.5015342   0.6325745
    0.2922267   0.3321719   0.4368588   0.4051954
    0.5664249   0.5935095   0.2693125   0.9184708
    0.          0.          0.          0.
    0.          0.          0.          0.
(:,:,2)
    0.0437334   0.4148104   0.7783129   0.6856896
    0.4818509   0.2806498   0.211903    0.1531217
    0.2639556   0.1280058   0.1121355   0.6970851
    0.          0.          0.          0.
    0.          0.          0.          0.

Samuel


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