From help-request at octave dot org Fri Mar  4 08:59:51 2005
Subject: Re: Saving matrices in octave binary format from f90
From: pagani <ypagani at univ-fcomte dot fr>
To: David Bateman <David dot Bateman at motorola dot com>
Cc: help at octave dot org
Date: Fri, 4 Mar 2005 08:55:06 -0600

ok I will try.
Thanks for your help
Dnia 04-03-2005, pi± o godzinie 12:42 +0100, David Bateman napisa³(a):
> ypagani at univ-fcomte dot fr wrote:
> 
> >Dear all,
> >I would like to know if (and how) it is possible to save complex vectors and 
> >complex matrices in octave binary format directly from fortran90.
> >I use intel fortran compiler (waiting for the release of GCC4.0 and gfortran) 
> >under Debian.
> >Best
> >regards
> >
> >
> >
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> >
> >Octave's home on the web:  http://www.octave.org
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> >
> Paul Laub sent a c code snippet to save in a matrix in the binary 
> format. See the message
> 
> http://www.octave.org/mailing-lists/help-octave/2004/2623
> 
> In the following messages in the thread I explained the bits of this 
> format he was uncertain of. See
> 
> http://www.octave.org/mailing-list/help-octave/205/2634
> 
> That is the four-bytes, FE FF FF FF that he was unsure of is the value 
> -2 in little-endian, as the file is marked with the header "Octave-1-L". 
> If he'd marked it with a "B" instead of an "L", the -2 would have to be 
> in big-endan format. The absolute value of the -2 is the number of 
> dimensions in the matrix, and the following values are the dimensions.
> 
> As for the other byte that Paul couldn't identify, it comes from the 
> file data-conv.h that defines the data type used to save the values in 
> the file. Paul's code forces them to be doubles, but in some cases they 
> might be floats or integers, and flagged differently as specificed in 
> data-conv.h
> 
> In any case Paul's message above will give you a good start on saving to 
> a binary format.
> 
> Regards
> David



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Octave is freely available under the terms of the GNU GPL.

Octave's home on the web:  http://www.octave.org
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