Prev: Reading from Csv File
Next: transform vector in matrix with more elements
From: Emily Bauner on 23 May 2010 18:15
Hi all,

I'm looking for a fast way to distribute vector elements in a given
matrix such that identical elements are listed in the same matrix row;
the tricky part is that the vector has fewer elements than the matrix.
For instance, assume that I have vector A:

A = [1 2 2 3 3 3 4 4 4 4 5 5 5 5 6 6 6 7 7 8]

I need some command that gives me matrix B, where B is

B =

1 0 0 0
2 2 0 0
3 3 3 0
4 4 4 4
5 5 5 5
6 6 6 0
7 7 0 0
8 0 0 0

This operation is very time-sensitive in my code as it has to be done
often and with varying vector/matrix sizes. Therefore I would like to
avoid a loop if at all possible.

Any ideas would be greatly appreciated.
 | 
Pages: 1
Prev: Reading from Csv File
Next: transform vector in matrix with more elements