how to allocate elements of a vector into different rows in a matrix, preserving the column order?
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Joao Ejarque
on 4 Dec 2013
Commented: Joao Ejarque
on 4 Dec 2013
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
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