21 Feb
2010
21 Feb
'10
8:44 p.m.
Hello, On Sun, Feb 21, 2010 at 10:29:40AM +0100, Jens Vollinga wrote:
# The following seems to take forever:
t; -E20^16*E4^8*E5^8*E1^16*q^4-(E10^24-E20^8*E5^16)*E4^16*E1^8+E2^24*E20^16*E5^8*q^4 factor(t);
# ctrl-C ginsh 815.46s user 3.39s system 94% cpu 14:26.22 total
Is the latter a huge-ish task or does ginac have a performance issue here?
I ran the example and I get an exception! So, it seems there is a bug somewhere.
It looks like a bug in gcd routines. Proof: try computing gcd(expand(t), expand(diff(t, q))) I'll try to find out what's going on here. Best regards, Alexei