[R] FORTRAN charcter strings

Prof Brian D Ripley ripley at stats.ox.ac.uk
Thu Jun 21 10:25:51 CEST 2001

On Thu, 21 Jun 2001, Thomas Dick wrote:

> Hello,
> I try to use a Windows DLL with FORTRAN routines in R. All routines work fine,
> except those which exchange a character variable with R.
> The documentation "Writing R Extensions" says it's compiler dependent whether
> character string exchange works with FORTRAN routines or not.
> Why doesn't it work with every compiler?

Why should it?  Why should the designer of a Fortran compiler anticipate
that Thomas Dick would want to call subprograms from a C routine and pass
in C character strings, and then spend time writing code to meet his

> Does anyone know a FORTRAN90 compiler for windows that works?

No.  Not even the matching g77 works.  *But* translation by f2c will work.

Otherwise write a wrapper in Fortran that avoids having to pass character
variables around.

Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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