numpy C-API：C中的标量乘法

Question

How can I perform an element-wise multiplication of a numpy-nd-array with an arbitrary double-scalar in C?

I'm searching for a api-function like this:

// C-code
PyArray_MultiplyWithScalar((PyArrayObject *) myarray, double scalar_value);

corresponding to pure numpy:

# pure python
myarray = myarray * scalar_value

My current (bad) solution is to iterate over all entries and perform the normalization manually.

Answer 1

I don't know the right answer to your question, but if you do a loop in C that should be as fast as it gets, I would even think faster than calling a python api function if you do it right. Doing it that way you can even edit the array in place without the need for additional memory.