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How to write this equation?....want optimized code?
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http://latex.codecogs.com/gif.latex?W=\Sigma%20_{k}{\alpha%20_{k}}y_{k}x_{k}
here...alpha is 7x1 matrix(7 elements). 'y' limit is 10x1(10 elements). 'x' limit is 7x50(350 elements).
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Walter Roberson
el 18 de Feb. de 2013
The formula you give only makes sense if alpha, y, and x, are all the same length, in which case it would be
sum( alpha .* y .* x )
Otherwise the subscript k makes no sense.
Your arrays are also not the proper size in the proper order in order for matrix multiplication to be intended. (y * alpha transpose * x) could work for matrix multiplication (in which case the multiplication would produce 10 x 50), but then the summation would not make sense. And besides, the order in the equation is not right.
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