problem with the sum function

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Rodrigo Franco
Rodrigo Franco 2020-7-2
回答： Image Analyst 2020-7-2
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?

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采纳的回答

madhan ravi
madhan ravi 2020-7-2
norma2 = sqrt(sum(X.^2))

更多回答（1 个）

Image Analyst
Image Analyst 2020-7-2
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

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