A Bug or not a bug?
- To: mathgroup at smc.vnet.net
- Subject: [mg74883] A Bug or not a bug?
- From: "dimitris" <dimmechan at yahoo.com>
- Date: Tue, 10 Apr 2007 05:12:45 -0400 (EDT)
This appears in another forum.
(Actually the third integral below. The discoverer regards it as a
bug.
The first two integrals are part of my response to him).
Integrate[Exp[x], {x, -Infinity, 0}] (*correct*)
1
Integrate[Exp[x], {x, 0, Infinity}] (*correct*)
Integrate::idiv: Integral of E^x does not converge on {0, Infinity}.
Integrate[Exp[x], {x, 0, Infinity}]
Integrate[Exp[x], {x, -Infinity, 0}, Assumptions -> x < 0]
(*incorrect*)
Integrate::idiv: Integral of E^(-x) does not converge on
{0,Infinity}.
Integrate[E^x, {x, -Infinity, 0}, Assumptions -> x < 0]
Since my experience about what must be regarded as a bug/feature is
not so
big as others in this forum I would like to see what you think about
the last
performance of Mathematica.
I personally don't regard it as a serious bug. It is like trying to
"cheat" Mathematica.
I am sure there are a great many ways to make built in functions to
give wrong results!
And what is more important the unecessary setting of Assumptions
caused it!
Your Opinion?
Dimitris