inconsistent outputs with version 3-1-2 Oct 2010

[vainsencher@…]

I'm running Linux 2.6.32-28-generic \#55-Ubuntu SMP Mon Jan 10 21:21:01 UTC 2011 i686 GNU/Linux on a laptop sony vaio.

the SAME code repeated, distinct answers: version 3-1-2 Oct 2010

ring r1=0,(x(1..10)),dp;
matrix m[3][35]=
0,0,0,0,0,x(7),0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,x(9),0,0,1,0,0,0,0,0,0,0,0,0,0,
0,0,x(7),0,0,x(6),0,0,-x(4)+x(8),0,0,0,0,0,0,0,0,0,-x(3)+x(10),0,0,0,0,0,-x(2),0,0,0,0,-x(5),0,0,0,-x(1),0,
0,0,x(4),0,0,1,0,0,x(3),0,0,0,0,0,0,x(5),0,0,x(1),0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0;

def j=simplify(jet(minor(m,3),1),2);j;
j[1]=x(7)
j[2]=x(4)-x(8)
j[3]=x(3)-x(10)
j[4]=-x(5)
j[5]=-x(1)

def j=simplify(jet(minor(m,3),1),2);j;
j[1]=x(7)
j[2]=x(4)-x(8)
j[3]=x(3)-x(10)
j[4]=-x(5)


std(jet(minor(m,3),1));

_[1]=x(7)
_[2]=x(5)
_[3]=x(4)-x(8)
_[4]=x(3)-x(10)
_[5]=x(1)

std(jet(minor(m,3),1));
_[1]=x(7)
_[2]=x(5)
_[3]=x(4)-x(8)
_[4]=x(3)-x(10)


int a,b;
for(int i=1;i<=111;i++){if(
size(std(jet(minor(m,3),1)))==4){a++;}else{b++;}
;}

a,b;
69 42

I could not replicate it on a different computer. I've tried a fresh aptitude reinstall singular-core. problem persists.

[Oleksandr]

please, post the output of 'Singular --version'.

I could not reproduce this behaviour on two 64 bit Linuxes and size was always 4, i.e. no x(1) at the end.

But with Singular32 (on snork) it does happen! (through the ratio was different: a,b; => 60 51)

the problem seems to be in minor (sizes: 45 / 59 !)