remove for-loop from following code

[Stefaan Himpe]

Hello all,

I have a question about optimizing my code.

I start from Y = [ 1 ; 3; 2 ]
I want to end up with Ytr = [ 1 0 0 0 ; 0 0 1 0 ; 0 1 0 0 ]
(so the number in Y indicates the column in which I want to see a one; 
the number of elements in each row can is given in the following code as 
a parameter D)

For now I do the following

function [Ytr] = ytransform(D, Y)
  [rows, cols] = size(Y);
  for row = 1:rows
    Ytr(:,row) = (1:D == Y(row));
  endfor
endfunction

Is there a way to do implement this without for loop over all rows of Y?

Best regards & thanks for this wonderful software.
Stefaan.