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MathGroup Archive 2005

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Re: Bug in Mathematica ?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg60805] Re: Bug in Mathematica ?
  • From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
  • Date: Thu, 29 Sep 2005 05:41:15 -0400 (EDT)
  • Organization: The Open University, Milton Keynes, U.K.
  • References: <dhdbeu$8fk$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Bidule 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.
> 
Not sure what bug you are talking about since I got 2/3 and 0.6666... 
respectively.

In[1]:=
Integrate[Max[x, y], {x, 0, 1}, {y, 0, 1}]
NIntegrate[Max[x, y], {x, 0, 1}, {y, 0, 1}]

Out[1]=
2/3

Out[2]=
0.6666666666666666

In[3]:=
N[%%]

Out[3]=
0.6666666666666666

In[4]:=
$Version

Out[4]=
"5.2 for Microsoft Windows (June 20, 2005)"

/J.M.


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