[Numpy-discussion] Attempting to wrap a Fortran-77 subroutine using f2py but I haven't been able to understand what is causing the error

[Melissa Mendonça]

Hello, Sam, sorry for taking so long to answer!

The problem seems to be that you are using

cf2py depend(in) Y, YP

instead of

cf2py depend(n) Y, YP <- (note that there was a spurious i in that depend
expression)

and that the callback FCN needs the dimension n as an argument. I was able
to compile your code correctly after making these changes.

If you have any further questions let me know, I hope this helps.

Cheers,

Melissa


On Wed, Oct 14, 2020 at 4:03 AM Samuel Dupree <sdupree at speakeasy.net> wrote:

> I'm attempting to wrap a Fortran-77 source member using f2py. I'm
> running he Anaconda distribution for Python 3.7.6 on a Mac Pro (2019)
> under Mac OS X Catalina (ver. 10.15.6). The version of NumPy I'm running
> is 1.18.3.
>
> I've attached a copy of the Fortran source code to this note (see
> rkfn78.for). The command I'm using to wrap this code is
>
> f2py3 -c rkfn78.for --fcompiler=gfortran --f77flags="-c -O -Wall" -m rkfn78
>
> The output I get is captured in the file rkfn78_build_output.txt.
>
> I don't understand the cause behind the error message I get, so any
> advice would be welcomed.
>
> Sam Dupree.
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> NumPy-Discussion at python.org
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