[Octave-bug-tracker] [bug #32401] failed check of onenormest

[Larry Doolittle]

Follow-up Comment #1, bug #32401 (project octave):

On the same system, three other self-tests fail: sparse/pcg.m sparse/pcr.m
special-matrix/hadamard.m
I can't confirm these failures are related, but they do have the same symptom
"panic: Illegal instruction -- stopping myself..."

I could isolate these faults to a self-contained handful
of lines.  There are two.  Notably, these snippets also crash octave-3.2.
---
# crash taken from scripts/sparse/pcg.m
# N<64 doesn't crash octave-3.2 or octave-3.4
N = 64;
A = zeros (N, N);
for i=1 : N - 1 # form 1-D Laplacian matrix
        A (i:i+1, i:i+1) = [2 -1; -1 2];
endfor
b = rand (N, 1);
X = A  b;
---
# crash adapted from scripts/special-matrix/hadamard.m
# also crashes with n=32
n=48;
h=hadamard(n);
size(h)
norm(h*h'-n*eye(n))
---
Hope this helps.


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