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MathGroup Archive 2005

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Re: Bug in Mathematica ?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg60797] Re: [mg60779] Bug in Mathematica ?
  • From: <bsyehuda at gmail.com>
  • Date: Thu, 29 Sep 2005 05:41:04 -0400 (EDT)
  • References: <200509280541.BAA08394@smc.vnet.net>
  • Reply-to: bsyehuda at gmail.com
  • Sender: owner-wri-mathgroup at wolfram.com

Why different?
In[1]:=
$Version
Out[1]=
5.2 for Microsoft Windows (June 20, 2005)
In[2]:=
Integrate[Max[x,y],{x,0,1},{y,0,1}]
Out[2]=
\!\(2\/3\)
In[3]:=
NIntegrate[Max[x,y],{x,0,1},{y,0,1}]
Out[3]=
0.666667
In[4]:=
Rationalize[%]
Out[4]=
\!\(2\/3\)

yehuda


On 9/28/05, Bidule <toto at truc.com> wrote:
>
> Hi,
>
> I've computed the following two expressions:
>
> Integrate[Max[x, y], {x, 0, 1}, {y, 0, 1}]
> NIntegrate[Max[x, y], {x, 0, 1}, {y, 0, 1}]
>
> which result in very different numbers. When I calculate the integral by
> hand I get (2/3).
>
> Any thoughts ? I guess by now it's probably a known bug. (or maybe even
> a 'feature').
>
> B.
>
>


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