Re: read real*8 binary
- To: mathgroup at smc.vnet.net
- Subject: [mg97504] Re: read real*8 binary
- From: David Bailey <dave at removedbailey.co.uk>
- Date: Sat, 14 Mar 2009 05:41:05 -0500 (EST)
- References: <firstname.lastname@example.org>
Jan Schmedes wrote:
> Dear group,
> I have a fortran program which writes a real array into a binary file.
> This binary file I could read without problems using
> Import["..."."Real32"]; But when I changed real to real*8 in the
> fortran program I could not read the file anymore (I used "Real64"
> instead of "Real32"), meaning I get numbers like 10^275. I used the
> same fortran compiler (ifort 10) and the same computer (Mac Pro) in
> both computations.
> Anyone has an idea why this does not work???
> Thank you!
This sounds rather puzzling to me.I would write a mini Fortran program
to output a number of REAL*8 numbers with known bit patterns - possibly
equivalencing them to integers so that you can print out the exact bit
pattern. Then you can check with a hex editor that the resultant file
actually contains the bit patterns you expect. My guess is that there is
a typo in your program somewhere.
Have you checked that your Fortran program is actually producing the
numbers you expect. For example, when you changed to REAL*8, did you end
up calling a function that required a REAL*4 with an argument that was
now REAL*8 perhaps.
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