Python for Fortran Programmers

[Bil Kleb]

It was neat to see Ruby naturally appear under this
thread recently on
http://tinyurl.com/c8vtf

 

[Stephan Mueller]

It was neat to see Ruby naturally appear under this
thread recently on news:comp.lang.fortran

I think Ruby is getting quite popular in SC now. Btw: Is there something
like f2py for ruby?

I guess one have to use swig instead to get a binding for a fortran lib.
But there seems to be no english tutorial on the web. Any hints?


Cheers,

Steph.

PS: Bil, sorry for the PM.

 

[ara.t.howard]

I think Ruby is getting quite popular in SC now. Btw: Is there something
like f2py for ruby?

I guess one have to use swig instead to get a binding for a fortran lib.
But there seems to be no english tutorial on the web. Any hints?


Cheers,

Steph.

PS: Bil, sorry for the PM.

better still - ruby/dl can call into fortan libs directory : no binding
required. i think this only works with f77 code though...

check this out

http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-talk/100842

regards.

-a

 

[pat eyler]

 

[Stephan Mueller]

better still - ruby/dl can call into fortan libs directory : no binding
required. i think this only works with f77 code though...

I guess you are right. Tried it with gfortran and all I get is a
segfault. Setting the -f2c compiler flag does not help either.

Maybe C is still the language of choice when it comes to exending ruby?


Cheers,

Steph.

 

[Stephan Mueller]

I guess you are right. Tried it with gfortran and all I get is a
segfault.

Ooops, this seems to be a problem with the way I pass over parameters
from ruby to the lib. Will have to double check this. Simple functions
without parameters do work.

Sorry for the noise.


Cheers,

- Steph.

 

[Josef 'Jupp' SCHUGT]

Hi!

better still - ruby/dl can call into fortan libs directory : no
binding required. i think this only works with f77 code though...

Many people actually do not need Fortran 90+ support. What they need
is support for huge FORTRAN 77 code bases that consist of millions of
code-lines and are the result of man-millenia of coding and debugging.
Even if one would hire *all* people of adequate numerical mathematics
skills that can program it would most probably take years to re-write
and sufficently test all that code in another language. And quite a
number of these people would not give up their research no matter what
you pay them.

Josef 'Jupp' Schugt

 

[Dean Wampler]

Fortran compilers pass arguments in the opposite order compared to C
and C++. I believe this is a "standard" and if I recall correctly,
it's because C/C++ support variable argument lists ("varargs"), while
Fortran doesn't; C passes the list in reverse order so it's easy to
mark both ends of the lists. ("Layman's" description )

dean

 

[John W. Kennedy]

Fortran compilers pass arguments in the opposite order compared to C
and C++.

Certain Fortran compilers on certain operating systems on certain
architectures do so.

--
John W. Kennedy
"But now is a new thing which is very old--
that the rich make themselves richer and not poorer,
which is the true Gospel, for the poor's sake."
-- Charles Williams. "Judgement at Chelmsford"

 

[Stephan Mueller]

Got it working now with Ruby 1.8.4 and gfortran-4.0. Thumbs up and thanks
for the help!


Steph.

 

[Bil Kleb]

Got it working now with Ruby 1.8.4 and gfortran-4.0. Thumbs up and thanks
for the help!

Steph, can you post an example somewhere?

Thanks,

 

[Stephan Mueller]

Steph, can you post an example somewhere?

Sure. Sorry for the delay. The link from Ara shows all you need. Compile
your fortran file with

gfortran --f2c --free-form -shared -O2 FILE.f -o LIB.so -fPIC

testet on Debian unstable with

ruby 1.8.4 (2005-12-24) [i486-linux]
GNU Fortran 95 (GCC 4.0.3 20060212 (prerelease) (Debian 4.0.2-9))

evil.rb seems to be neccessary only in case you have output parameters
and arrays on the fortran side of life.


Cheers,

Steph.

 

[Ryan Davis]

If there are any fortran gurus out here, I've long thought that a
RubyInline::Fortan would be a nice thing to see.

I'm willing to help with this, but I don't know squat about fortran
(and honestly, don't want to). However, getting it working for
RubyInline would be a very cool feat and I can finally get some my
friend at LBLL to maybe start using ruby.

 

[pat eyler]

I'm willing to help with this, but I don't know squat about fortran
(and honestly, don't want to). However, getting it working for
RubyInline would be a very cool feat and I can finally get some my
friend at LBLL to maybe start using ruby.

Just to pull things together, I created

http://www.rubygarden.org/ruby?RubyFortran