#6816: sage/maxima hang when doing an indefinite integral
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Reporter: was | Owner: burcin
Type: defect | Status: new
Priority: major | Milestone: sage-4.1.2
Component: calculus | Keywords:
Reviewer: | Author:
Merged: |
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Integration sometimes hangs in sage-4.1.1.
{{{
flat:~ wstein$ sage
----------------------------------------------------------------------
| Sage Version 4.1.1, Release Date: 2009-08-14 |
| Type notebook() for the GUI, and license() for information. |
----------------------------------------------------------------------
sage: var('t,theta')
(t, theta)
sage: integrate(t * cos(-theta*t), (t,-oo,oo))
[.. and it hangs forever ..]
}}}
In fact, in Maxima what is happening is the following:
{{{
(%i6) integrate(t*cos(-theta*t),t,-inf,inf);
Is theta positive, negative, or zero?
positive <--- i type this.
;
(%o6) 0
(%i7)
}}}
For some reason the question "Is theta positive, negative, or zero?" is
not getting seen by pexpect as it should. Argh!
This works in Maxima:
{{{
(%i1) assume(theta>0);
(%o1) [theta > 0]
(%i2) integrate(t*cos(-theta*t),t,-inf,inf);
(%o2) 0
}}}
The same doesn't work in Sage though, which is very weird:
{{{
sage: var('t,theta')
(t, theta)
sage: assume(theta>0)
sage: integrate(t * cos(-theta*t), (t,-oo,oo))
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/6816>
Sage <http://sagemath.org/>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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