[scilab-Users] matrix values extraction

[Frédéric Mabille]

and other idea is :

diag( a ( : , c ( : ) ) ) 

fred

Le 25 janv. 2011 à 15:32, Jean-Damien Capdeville a écrit :

> Dear all,
> 
> I'm looking to extract from a matrix "A" one value for each line. The column
> positions of the value to extract would be given by a vector "c".
> 
> Here is an example:
> A = [ 1 2 3 ; 4 5 6 ; 7 8 9 ; 10 11 12 ; 13 14 15 ]
> 
> c = [ 3 ; 1 ; 1 ; 2 ; 3 ]
> 
> How can I get the resulting vector [ 3 ; 4 ; 7 ; 11; 15 ] ?
> 
> I'm currently using a loop which is obviously a time expensive solution with
> large matrix.
> Any ideas to get it more efficiently?
> 
> Thanks,
> 
> 
> Jean-Damien
> 
> 
> 


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