Merge matrix in for loop matlab

Question

i have a matrix c[38,39] , and want to merge it to a new one lets say f[1,1482] . So first i pre-allocate the f and then in a for loop i tried to merge it, but it keeps saying that i exceeded the matrix dimensions.I know that there is the cat function but i get the same results, maybe the reshape function will help? Any advice appretiated, thanks in advance.

f=[];       %// pre-allocating the mew matrix
for k=1:1482    %// 1482=38*39
f(:,k)=[c(:,1);c(:,k)]; %// merging 
end

Answer 1

It exceeds matrix dimensions because the second dimension of c is 39 and your loop is referencing values up to 1482.

Reshape may help if you are looking at different matrix sizes but if you are just wanting to convert from a matrix to a vector then just using the (:) notation works.

c=rand(38,39);
f=c(:)';

ps. pre-allocating f only really helps if you specify the final matrix size. Here all you have done is declared an empty matrix which then expands on each loop iteration.