problem with the sum function

Hello everyone, im trying to solve this exercise

but appear a error that i dont know how to solve

"Error using  ^ 
Inputs must be a scalar and a square matrix.
To compute elementwise POWER, use POWER (.^) instead."

this is my code:

function [norma2] = normalizacao(X)
    [n, m] = size(X);
    for i = 1:n
        for j = 1:m
            norma2(i, j) = sqrt(sum(X(i, :)^2))
        end
    end
end

Someone can help me?

Answer 1

[madhan ravi]

norma2 = sqrt(sum(X.^2))

[Rodrigo Franco]

thanks

Answer 2

[Image Analyst]

You need to leave i as a variable because it did not say to sum over i. So just sum over the j dimension for a given i.

Try this:

norma2 = sqrt(sum(X(i, 1 : M) .^ 2));

No loops needed. Perhaps M is the number of columns, but it didn't say that explicitly so I'm just leaving it as M