[Rd] Calling FORTRAN function from R issue?

Berend Hasselman bhh at xs4all.nl
Tue Mar 6 16:00:45 CET 2012

On 06-03-2012, at 15:46, Berend Hasselman wrote:

>>> Thus, perhaps strangely, if there is only a
>>> 	external double complex zdotc
>>> declaration in your subroutine, the compiler doesn't know that a call
>> The only 'strangely' thing is that is accepted: AFAICS is it not valid according to the link above.
> Agree. The fortran 77 standard doesn't allow that syntax and I'm really surprised that no error is flagged.

Got it.
See http://www.fortran.com/F77_std/rjcnf0001-sh-3.html#sh-3.1.6

Compiler ignores the blanks and

	external double complex zdotc


	external doublecomplexzdotc	

And that is legal.

And how long have I been using Fortran? I won't tell.


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