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MathGroup Archive 1997

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Re: False result with Integrate ?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg8744] Re: [mg8711] False result with Integrate ?
  • From: "Sherman.Reed" <sherman.reed at worldnet.att.net>
  • Date: Sat, 20 Sep 1997 22:28:10 -0400
  • Sender: owner-wri-mathgroup at wolfram.com

Giles,

First plot the function using plotted. I assume you want to calculate
the area from the xy plane to the curve.

Second, consider the following integral

Integrate[Integrate[x,{x,y,1}],{y,0,1}], which when evaluated in 2.2, 3.0,
2.2.3
gives the exact result of 1/3

Sherman C. Reed
sherman.reed at worldnet.att.net


----------
> From: Gilles BARBIER <Gilles.Barbier at der.edfgdf.fr>
To: mathgroup at smc.vnet.net
> To: mathgroup at smc.vnet.net
> Subject: [mg8744] [mg8711] False result with Integrate ?
> Date: Friday, September 19, 1997 1:47 AM
> 
> 
>      Help !
>      
>      Why : Integrate[Integrate[ Sqrt[(x-y)^2],{x,0,1}],{y,0,1}]
>      gives 0 with math2.2 or math3.0.
>      
>      The exact result is 1/3 !!
>      
>      Gilles
>      EDF/DER


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