Storing Matrices from a for loop

Hello everyone,

I want to multiply a matrix with a vector, in a for loop. In this case q is a continuous variable.

for q = 0:2:8;

B = [q,  sin(q) ; 
     cos(q),  3*q ;
     q, cos(q)]

h = [q;  sin(q); 4]

A = B.' * h

end

Now my problem is, that I don't know how to store the result of B, h and A of each loop.

Or is there another solution without a for loop to fill the matrix B with each step? That would be easier for my code.

Best regards

Answer 1

[Jos (10584)]

One option is to use an index to loop over the values, like this. You can than directly use that index to create a cell array to store the individual matrices A B and h. Like this

Qlist = 0:2:8
for k = 1:numel(Qlist)
    q = Qlist(k) ;
    B{k} = [q,  sin(q) ; 
         cos(q),  3*q ;
         q, cos(q)]
    h{k} = [q;  sin(q); 4]
    A{k} = B{k}.' * h{k}
end

[madhan ravi]

Also variables could be preallocated.