Summing squared elements of a column of a matrix

for i=1:N
s(i)=sum(V(:,2))/sqrt(n);
t(i)=sum(V(:,2))/sqrt(sum((V(:,i).*V(:,i)));
end

Both s and t are Nx1 vectors, while V is a nxN matrix. In s I summed the elements of each column of V for every element of s. How can I divide, in t, by the square root of the sum of the SQUARED elements of each column of V?

Answer 1

[Star Strider]

It’s not clear what you want to do.

Try this:

V = rand(6,5);                                          % Guess What ‘V’ Is
n = size(V,1);
N = size(V,2);

s = sum(V)/sqrt(n);                                     % Sum Over Columns, Divide By ‘sqrt(n)’
t = sum(V)./sqrt(sum(V.^2,2));                          % Sum Over Columns, Divide By ‘sum(sqrt(Rows))’