'for' loop won't loop

Question

I have the following code

for i = 1:8760
    A = [PVtech(i,:) WTtech(i,:)];
    b = demand(i);
    f = [CRF * PVtechcost(i,:) .* PVcap(i,:) ./ PVtech(i,:) CRF*WTtechcost(i,:) .* WTcap(i,:) ./ WTtech(i,:)];
    x(i) = linprog(f, A,b,[], [], lb);
end

I'm trying to optimize linprog over the 8760 data set but can't seem to get the loop going for each row.
When I run it I get a size of `A to be 1x30 (when it should be 8760 by 30).

Does anyone see where I have coded wrongly?

Answer 1

Yes, every time you run it you are overwriting A with the single row [PVtech(i,:) WTtech(i,:)]

Try this: A = [A; PVtech(i,:) WTtech(i,:)]; i.e. vertical concatenation

With preallocation your code would look like this:

numRows = 8760;
A = zeros(numRows, 30);

for i = 1:numRows

    A(i,:) = [PVtech(i,:) WTtech(i,:)];

    b = demand(i);

    f = [CRF*PVtechcost(i,:).*PVcap(i,:)./PVtech(i,:) CRF*WTtechcost(i,:).*WTcap(i,:)./WTtech(i,:)];

    x(i) = linprog(f, A,b,[], [], lb);

end