1D array to 2D array positions

I would like to 'convert' a 1D array to a 2D matrix considering the value inside the array as:

A =
     1     3     4     4     3
B =
     0     0     0     0     0
     0     0     1     1     0
     0     1     0     0     1
     0     0     0     0     0
     1     0     0     0     0

Can you suggest a very fast way to do that?

The row number is fixed at 5 here (a known value).

Answer 1

[James Tursa]

n = 5;
B = zeros(n,size(A,2));
B(sub2ind(size(B),n+1-A,1:size(A,2))) = 1;