subtract line by line and storage

i have an arror in this code...i want to store the result in
a matrix line by line, how i can?

thanks

??? In an assignment A(I) = B, the number of elements in B and
I must be the same.

k is a costant.


for class_num = 1:10
matrix(???) = ((f_norm(k,:) - f_mean(class_num,:)).^2);
end
.

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