leif wrote:
leif wrote:
Dominique Laurain wrote:
I usually factor "small" polynomials...but this time I got a
"Segmentation fault" for a bigger one...is it ok to get that error (no
control of enough memory or processor task force to get the result) ?
Maybe I want toooo much :-) ... over the quota.?
Certainly not a (out of) memory error; I can reproduce it with Sage
6.3.beta2, FWIW.
The answer is instantaneous with Sage 5.7 and 5.8: :-)
Factor f : 4*(v + w - 1)^3*(4*u^3*v^3 + 24*u^3*v^2*w + 20*u^3*v*w^2 +
4*u^3*w^3 + 20*u^2*v^3*w + 80*u^2*v^2*w^2 + 24*u^2*v*w^3 + 24*u*v^3*w^2
+ 20*u*v^2*w^3 + 4*v^3*w^3 - 16*u^3*v^2 - 44*u^3*v*w - 16*u^3*w^2 -
16*u^2*v^3 - 132*u^2*v^2*w - 132*u^2*v*w^2 - 16*u^2*w^3 - 44*u*v^3*w -
132*u*v^2*w^2 - 44*u*v*w^3 - 16*v^3*w^2 - 16*v^2*w^3 + 18*u^3*v +
19*u^3*w + 52*u^2*v^2 + 151*u^2*v*w + 52*u^2*w^2 + 19*u*v^3 +
151*u*v^2*w + 151*u*v*w^2 + 18*u*w^3 + 18*v^3*w + 52*v^2*w^2 + 19*v*w^3
- 6*u^3 - 47*u^2*v - 48*u^2*w - 48*u*v^2 - 137*u*v*w - 47*u*w^2 + 13*u^2
- 6*v^3 - 47*v^2*w - 48*v*w^2 + 37*u*w + 13*v^2 - 6*w^3 + 37*u*v +
37*v*w + 13*w^2 - 9*u - 9*v - 9*w + 2)*u*w^2
P.S.: Works with Sage 6.1.1 as well:
Factor f : 4*(4*u^3*v^3 + 24*u^3*v^2*w + 20*u^2*v^3*w + 20*u^3*v*w^2 +
80*u^2*v^2*w^2 + 24*u*v^3*w^2 + 4*u^3*w^3 + 24*u^2*v*w^3 + 20*u*v^2*w^3
+ 4*v^3*w^3 - 16*u^3*v^2 - 16*u^2*v^3 - 44*u^3*v*w - 132*u^2*v^2*w -
44*u*v^3*w - 16*u^3*w^2 - 132*u^2*v*w^2 - 132*u*v^2*w^2 - 16*v^3*w^2 -
16*u^2*w^3 - 44*u*v*w^3 - 16*v^2*w^3 + 18*u^3*v + 52*u^2*v^2 + 19*u*v^3
+ 19*u^3*w + 151*u^2*v*w + 151*u*v^2*w + 18*v^3*w + 52*u^2*w^2 +
151*u*v*w^2 + 52*v^2*w^2 + 18*u*w^3 + 19*v*w^3 - 6*u^3 - 47*u^2*v -
48*u*v^2 - 6*v^3 - 48*u^2*w - 137*u*v*w - 47*v^2*w - 47*u*w^2 - 48*v*w^2
- 6*w^3 + 13*u^2 + 37*u*v + 13*v^2 + 37*u*w + 37*v*w + 13*w^2 - 9*u -
9*v - 9*w + 2)*u*(v + w - 1)^3*w^2
FWIW, Singular has been upgraded from 3.1.5 (in Sage 6.1.1) to 3.1.6
(6.2 and later), so this might be an upstream regression.
The .factor() function in the Sage library hasn't changed at all AFAICS,
but other changes in Sage may have borked it as well, although the
function which apparently causes the segfault, p_Copy(), is a Singular
function.
The Sage-Singular experts should investigate...
-leif
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