On Thu, Dec 22, 2005 at 09:11:44AM -0600, Douglas Bates wrote: > On 12/21/05, Dirk Eddelbuettel <edd@debian.org> wrote: > > | 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? Does the follow provide enough detail or should I recompile with -g? Program received signal SIGILL, Illegal instruction. [Switching to Thread -1240947008 (LWP 9259)] 0xb670b656 in ATL_diamax_xp1yp0aXbX () from /usr/lib/atlas/libblas.so.3 (gdb) where #0 0xb670b656 in ATL_diamax_xp1yp0aXbX () from /usr/lib/atlas/libblas.so.3 #1 0xb68f33a8 in ?? () from /usr/lib/atlas/libblas.so.3 #2 0x00000009 in ?? () #3 0x08f508c8 in ?? () #4 0xb670b4a5 in ATL_idamax () from /usr/lib/atlas/libblas.so.3 #5 0x00000009 in ?? () #6 0x08f508c8 in ?? () #7 0x00000001 in ?? () #8 0x00000009 in ?? () #9 0xb670b440 in ATL_dgpr1U_a1_x1_yX () from /usr/lib/atlas/libblas.so.3 #10 0xb6e3d578 in ?? () from /usr/lib/atlas/liblapack.so.3 #11 0x08f508c8 in ?? () #12 0xb6932c8c in cblas_idamax () from /usr/lib/atlas/liblapack.so.3 #13 0x00000009 in ?? () #14 0x08f508c8 in ?? () #15 0x00000001 in ?? () #16 0x00000009 in ?? () #17 0xb6932c50 in cblas_icamax () from /usr/lib/atlas/liblapack.so.3 #18 0xb6e3d578 in ?? () from /usr/lib/atlas/liblapack.so.3 #19 0x08f50910 in ?? () #20 0xb6913d43 in ATL_dgetrfC () from /usr/lib/atlas/liblapack.so.3 #21 0x08f50258 in ?? () #22 0x08f4fe3c in ?? () ---Type <return> to continue, or q <return> to quit--- #23 0x08f50058 in ?? () #24 0x08f50058 in ?? () #25 0x00000000 in ?? () #26 0x00000000 in ?? () #27 0x08f50058 in ?? () #28 0x08f50058 in ?? () #29 0x08f50258 in ?? () #30 0x08f4fe3c in ?? () #31 0x00000000 in ?? () #32 0x00000009 in ?? () #33 0x08f50258 in ?? () #34 0x08f4fe3c in ?? () #35 0x08f50058 in ?? () #36 0xb6e3d578 in ?? () from /usr/lib/atlas/liblapack.so.3 #37 0x00000009 in ?? () #38 0x08f4f898 in ?? () #39 0x00000002 in ?? () #40 0xb6913c27 in ATL_dgetrfC () from /usr/lib/atlas/liblapack.so.3 #41 0x08048430 in ?? () #42 0xb7880b9c in ?? () from /usr/lib/octave-2.9.4/liboctinterp.so #43 0x08f50022 in ?? () #44 0x08f50058 in ?? () #45 0x08f50258 in ?? () ---Type <return> to continue, or q <return> to quit--- #46 0x08f4fe3c in ?? () #47 0xb783775c in ?? () from /usr/lib/octave-2.9.4/liboctinterp.so #48 0x0f3a8b99 in ?? () #49 0xb7880b9c in ?? () from /usr/lib/octave-2.9.4/liboctinterp.so #50 0x08f4fe3c in ?? () #51 0xb612cc34 in free () from /lib/tls/i686/cmov/libc.so.6
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