HOW TO IMPROVE THE ASSIGNMENT OF DATA IN A SPARSE MATRIX?

Hi, All,

I want to improve this code, i have to use sparse matrix and store the data from matrix A to RIG(sparse matrix).

RIG=sparse(10000,10000);
A=rand(3,3);
GDL = randi([10 9000],10000,3);
for i=1:10000
    P=GDL(i,:);
    RIG(P,P)=A;
end

Total Time:0.930 aprox

Thanks for your time! Any reply will be highly appreciated!

[Walter Roberson]

Use spalloc to set the matrix to hold 9*10000 elements. That will make the assignment more efficient.