[sage-devel] Re: spurious integral of signum; was: Integration of function and it's simplified version yields different results

2016-04-14 Thread kcrisman
As a postscript, see http://trac.sagemath.org/ticket/11590#comment:19 where it looks like at least this issue has been fixed upstream! Thanks, Robert. -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiv

[sage-devel] Re: spurious integral of signum; was: Integration of function and it's simplified version yields different results

2016-04-12 Thread kcrisman
> > Oh dear. abs_integrate is something I now dread to think about; it is > so > > very useful, and yet so very buggy with the Sage flags - see > > http://trac.sagemath.org/ticket/12731 :-( > > Hmm, what are the flags that cause trouble? My guess is that the > abs_integrate code was written

[sage-devel] Re: spurious integral of signum; was: Integration of function and it's simplified version yields different results

2016-04-12 Thread Dima Pasechnik
On Tuesday, April 12, 2016 at 10:12:19 PM UTC+1, Robert Dodier wrote: > > On 2016-04-12, kcrisman > wrote: > > > Oh dear. abs_integrate is something I now dread to think about; it is > so > > very useful, and yet so very buggy with the Sage flags - see > > http://trac.sagemath.org/ticket/127

[sage-devel] Re: spurious integral of signum; was: Integration of function and it's simplified version yields different results

2016-04-12 Thread Robert Dodier
On 2016-04-12, kcrisman wrote: > Oh dear. abs_integrate is something I now dread to think about; it is so > very useful, and yet so very buggy with the Sage flags - see > http://trac.sagemath.org/ticket/12731 :-( Hmm, what are the flags that cause trouble? My guess is that the abs_integrate

[sage-devel] Re: spurious integral of signum; was: Integration of function and it's simplified version yields different results

2016-04-12 Thread kcrisman
On Tuesday, April 12, 2016 at 2:50:01 PM UTC-4, Robert Dodier wrote: > > On 2016-04-09, Sergey V Kozlukov > > wrote: > > > (%i1) f(r,phi) := signum(r^2 - 4); > >2 > > (%o1) f(r, phi) := signum(r - 4) > > (%i2) integrate(int