C is it always faster than nump?

[Dan Stromberg]

On Fri, Feb 25, 2022 at 8:12 AM BELAHCENE Abdelkader <
abdelkader.belahcene at enst.dz> wrote:

> Hi,
> a lot of people think that C (or C++) is faster than python, yes I agree,
> but I think that's not the case with numpy, I believe numpy is faster than
> C, at least in some cases.
>

This is all "last time I heard".

numpy is written, in significant part, in Fortran.

Fortran, especially for matrix math with variable dimensions, can be faster
than C.

Fortran, (still last I heard) did not support pointers, which gives Fortran
compilers the chance to exploit a very nice class of optimizations you
can't use nearly as well in languages with pointers.

I used to code C to be built with the "noalias" optimization, to get much
of the speed of Fortran in C.  But it required using an error prone subset
of C without good error detection.