filling matrix instead of using for loops

Hi,

I want to fill my Matrix in following way.

I have 2 vectors that are used by my Matrix. Say

VectorA = 1:10;
VectorB = 20:29;

And I want to use them to fill my matrix.

for m = 1:10
   for n = 20:29
       MatrixK = [sin(m),cos(n);cos(n).*sin(m),exp(m)];
       % MatrixK will be used here
   end 
end

However, as you know, it is not efficient as these 2 for loops have to be run by 100x100 times. How can I do it efficiently? I am not sure I have fully defined my problem. Most likely, I will add sth.

Thanks

Answer 1

[Andrei Bobrov]

A = 1:10;
B = 20:29;

[m,n] = ndgrid(A,B)
K = [sin(m),cos(n);cos(n).*sin(m),exp(m)];
s = size(K);
p = size(m);
q = s./p;
z0 = reshape(K,p(1),p(2),q(1),q(2));
MatrixK = reshape(permute(z0,[2 1 4 3]),s(1),[]);