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Multiply each row of a matrix with its transpose
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Multiply each row of a matrix with its transpose
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The formula I have to translate to Octave/Matlab goes something like this:
\sum (v_i - m) (v_i - m)^T
I have a matrix, and I need to take each row, subtract m from it and then multiply it with its own transpose. I wrote the inner part as a function:
function w = str(v, m)
y = v - m
w = y * transpose(y)
end
My matrix is like this
xx = [1 2 3 4 5; 1 2 3 4 5; 1 2 3 4 5]
Now I have no idea how to apply this function to each row in a matrix and then sum them up to a new matrix. Maybe someone can help me here.
EDIT: The result is not the dot product. I'm looking for v * v^T, which has a matrix as result!
Probably you need this
X = bsxfun( @minus, A, m );
Y = X'* X;
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