how to allocate elements of a vector into different rows in a matrix, preserving the column order?

Consider

Z = zeros(4,2); 
X = [0.15 , 0.33]; 
P=[2 3];

I am looking for the simplest form of applying P to X and Z so that I obtain:

Z = [0  0; 0.15  0; 0 0.33; 0 0];

The vector P is a vector of indices that applies to the vector X, and positions the column elements of X in the rows of Z indicated in P. So, the number 0.15 moves Down to row 2, (still in column 1) and the number 0.33 moves Down to row 3 (and column 2);

Of course, this is an example. It will apply to much bigger objects.

Thank you.

Joao Ejarque

Answer 1

[Andrei Bobrov]

Z = zeros(4,2);
Z(sub2ind(size(Z),P,1:numel(P))) = X;

[Joao Ejarque]

great. thank you.