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