From vioravis at gmail.com  Wed May  4 14:26:49 2011
From: vioravis at gmail.com (vioravis)
Date: Wed, 4 May 2011 05:26:49 -0700 (PDT)
Subject: [Rd] Error in .Fortran Call
Message-ID: <1304512008660-3495319.post@n4.nabble.com>

I have the following FORTRAN code converted to a DLL:

! my_xmean.f90
!
! FUNCTIONS/SUBROUTINES exported from my_function.dll:
! my_function - subroutine
!
subroutine my_xmean(X,N,XMEAN) 

! Expose subroutine my_function to users of this DLL
!
!DEC$ ATTRIBUTES DLLEXPORT,C,REFERENCE,ALIAS:'my_xmean_'::my_xmean 

! Body of my_function

DOUBLE PRECISION X(N)

XMEAN=0D0
DO J=1,N
XMEAN=XMEAN+X(J)
END DO
XMEAN=XMEAN/N
RETURN 
end subroutine my_xmean



When I call this DLL from R, it gets loaded properly but the values of XMEAN
calcualted are way off:


x <- 1:6

> .Fortran("my_xmean",as.double(X),as.integer(length(X)),double(1))

[[1]]
[1] 1 2 3 4 5 6

[[2]]
[1] 6

$xmean
[1] 5.336073e-315

Can someone please let me what is causing this huge difference??? Thank you.

Ravi



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[Rd] Error in .Fortran Call
vioravis