[Numpy-discussion] Speed of matrix multiplication

[Travis E. Oliphant]

Keith Goodman wrote:
> Why is a.T*b slower than M.dot(a.T, b)? Does it take longer to parse
> or something?
>   
The issue I think is that a is a Python class and so takes a bit longer 
to do all the things being done which includes:

1) running the Python __mul__ function
2) creating a new array (including running the __array_finalize__ Python 
function).

-Travis