Numpy only supports operations one at a time. With that said, there are several workarounds. In place operations. ... <看更多>

What is available for NumPy arrays? (1) element-wise multiplication: * and sum (2) element-wise multiplication: np.multiply and sum (3) ... ... <看更多>

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Actually the * operator does element-wise multiplication. So you need to use .dot() function to get the desired result. Example : ... <看更多>

an array is multiplied by a array of booleans. I'm pretty sure that numpy does some optimisations, in particular when all the values are False :. ... <看更多>