On Tue, Apr 12, 2011 at 9:06 PM, Mathew Yeates <[email protected]> wrote:
> I have
> subroutine foo (a)
> integer a
> print*, "Hello from Fortran!"
> print*, "a=",a
> a=2
> end
>
> and from python I want to do
> >>> a=1
> >>> foo(a)
>
> and I want a's value to now be 2.
> How do I do this?
>
With
subroutine foo (a)
integer a
!f2py intent(in, out) a
print*, "Hello from Fortran!"
print*, "a=",a
a=2
end
you will have desired effect:
>>> a=1
>>> a = foo(a)
>>> print a
2
HTH,
Pearu
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