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Re: Read & write data files b/w IDL & Fortran 90 [message #39009]

Wed, 14 April 2004 13:56

Paul Van Delst[1]
Messages: 1157
Registered: April 2002

Senior Member

bridgemat wrote:
> Hey, thanks Paul! I'll give it a try. My actual data is all float/real
> kind of stuff, so I hopefully wouldn't have this problem there. I was
> just trying to see if I could do it with an "easy" case, but I guess
> simple isn't always easy! :)

Hello,

Best thing is to present the case that is causing the problem.

You're right, though. You shouldn't have the problem I rabbited on about with regular
floats - assuming you have the default declarations in IDL, e.g.

x = 0.0

and Fortran90,

REAL :: x
x = 0.0

If you have either

; IDL
x = 0.0d

or

; Fortran90
INTEGER, PARAMETER :: dp = SELECTED_REAL_KIND( 15 )
REAL( dp ) :: x
x = 0.0_dp

but not both, then the same problem may be occurring.

BTW, I read/write datafiles in IDL and write/read them in Fortran90 all the time (both the
sequential and direct unfromatted variety). Never had any problems - as long as I'm on
the same system. Otherwise you may have byte-sex issues, i.e. reading files created on a
little-endian system (PC,Alpha) on a big-endian one (IBM,SGI,Sun,HP,...) or vice-versa.

paulv

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[Message index]

		Re: Read & write data files b/w IDL & Fortran 90 By: Paul Van Delst[1] on Wed, 14 April 2004 13:56
		Re: Read & write data files b/w IDL & Fortran 90 By: bridgemat on Wed, 14 April 2004 13:45
		Re: Read & write data files b/w IDL & Fortran 90 By: Paul Van Delst[1] on Fri, 09 April 2004 13:44
		Re: Read & write data files b/w IDL & Fortran 90 By: Paul Van Delst[1] on Fri, 09 April 2004 13:37
		Re: Read & write data files b/w IDL & Fortran 90 By: bridgemat on Fri, 09 April 2004 13:20
		Re: Read & write data files b/w IDL & Fortran 90 By: bridgemat on Fri, 09 April 2004 12:35
		Re: Read & write data files b/w IDL & Fortran 90 By: Paul Van Delst[1] on Thu, 08 April 2004 14:45
		Re: Read & write data files b/w IDL & Fortran 90 By: wmconnolley on Thu, 08 April 2004 15:00

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