David Cournapeau wrote:
> Hi,
>
> Is there a way to generate simple C code from complex numbers with
> cython. For example, something like
>
> cdef complex foo(complex a, complex b):
> return a - b
>
> which would become in C:
>
> complex foo(complex a, complex b)
> {
> return a - b;
> }
>
> And ideally, an easy way to handle complex/imaginary as members
> (a.imag, etc...); assuming the C compiler supports complex.h, of
> course.
>
There seems to be a positive attitude towards including complex support
in Cython natively, it's just about lack of developer time...
You can fake it, but it is a bit dangerous:
cdef extern from *:
ctypedef float complex
Problems to watch out:
1) This means that Cython will think that complex numbers are
automatically castable to float and it will be C that raises any error.
(Especially for float* vs. complex*)
2) You need to declare seperate functions for getting real and imag parts.
3) No auto-coercion to/from Python complex, must do it manually (and use
the functions from 2) in the process).
I think this is as good as it gets, at least I can't think of anything
else within the Cython that's there today.
Dag Sverre
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