[Octave-bug-tracker] [bug #38326] save -binary or load fails with big matrices

[Rik]

Follow-up Comment #2, bug #38326 (project octave):

The issue is that the number of bytes to write out is an octave_idx_type.  You
can check in your config.h file located in the top-level directory.  In
general, you probably have


/* Define to the type of octave_idx_type (64 or 32 bit signed integer). */
#define OCTAVE_IDX_TYPE int


This is generally a signed 32-bit integer.  Taking away one bit for the sign
leads to a byte-limit on files of 2^31 or 2GB.

One option, particularily if you will have very large matrices, is to compile
with '--enable-64' which will make the octave_idx_type 64 bits.  I've verified
that this works.  However, this isn't exactly optimal as this feature is
experimental and you would alno  This is currently experimental though and
could require re-compiling your Fortran libraries (BLAS, LAPACK, ARPACK, etc.)
for 64-bit pointers and not just Octave itself.

I'll bring this up on the octave-maintainers list to see if we want to do
something short term to fix this.


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