Bug#344281: [Pkg-octave-devel] Bug#344281: panic: Illegal instruction in det(eye(x))
On 12/21/05, Dirk Eddelbuettel <edd@debian.org> wrote:
>
> On 21 December 2005 at 20:18, joshua@nirmalvihar.info wrote:
> | Package: octave2.9
> | Version: 2.9.4-8
> | Severity: normal
> |
> | I tried to octave2.1 also, det(eye(9)) gives a panic: Illegal
> | instruction. det(eye(4)), 5, 6, 7, 8 works though. It's a mystery.
>
> I very vaguely recall a bug report with respect to Lapack that came up in R
> that was triggered by one matrix size only. If memory serves, it was 9 as
> well. This is the reason we build R with its own copy of Lapack.
>
> I cannot recall what the exact circumstances were, but maybe Doug or Brian
> (CC'ed) can remember ?
I believe that bug was in an eigenvalue-eigenvector calculation. I
imagine this calculation is done using an LU decomposition or, if the
matrix is recognized as being symmetric, a Bunch-Kaufman
decomposition.
Can you create a traceback to show where it is generating the illegal
instruction?
> Regards, Dirk
> |
> | -- System Information:
> | Debian Release: 3.0
> | APT prefers testing
> | APT policy: (500, 'testing')
> | Architecture: i386 (i686)
> | Kernel: Linux 2.6.14-b1
> | Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8
> |
> | Versions of packages octave2.9 depends on:
> | ii atlas3-base [liblapack.so.3] 3.6.0-19 Automatically Tuned Linear Algebra
> | ii fftw3 3.0.1-11 Library for computing Fast Fourier
> | ii libc6 2.3.5-3 GNU C Library: Shared libraries an
> | ii libgcc1 1:4.0.2-5 GCC support library
> | ii libgfortran0 4.0.2-5 Runtime library for GNU Fortran ap
> | ii libglpk0 4.8-3 linear programming kit (shared lib
> | ii libhdf5-serial-1.6.4-0c2 [lib 1.6.4-4 Hierarchical Data Format 5 (HDF5)
> | ii libncurses5 5.4-9 Shared libraries for terminal hand
> | ii libreadline5 5.0-10 GNU readline and history libraries
> | ii libstdc++6 4.0.2-5 The GNU Standard C++ Library v3
> | ii libumfpack4 4.4-3 set of routines for solving unsymm
> | ii texinfo 4.6-1 Documentation system for on-line i
> | ii zlib1g 1:1.2.2-8 compression library - runtime
> |
> | -- no debconf information
> |
> |
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>
> --
> Hell, there are no rules here - we're trying to accomplish something.
> -- Thomas A. Edison
>
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