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MathGroup Archive 1997

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Correction to orig message

  • To: mathgroup at smc.vnet.net
  • Subject: [mg8755] Correction to orig message
  • From: "Sherman.Reed" <sherman.reed at worldnet.att.net>
  • Date: Sat, 20 Sep 1997 22:28:20 -0400
  • Sender: owner-wri-mathgroup at wolfram.com

 Giles,
 
 Plot3D somehow came out as plotted. Sorry
 
 Sherman

> ----------
> > From: Sherman.Reed <sherman.reed at worldnet.att.net>
> > Subject: [mg8755] Re: [mg8711] False result with Integrate ?
> > Date: Friday, September 19, 1997 2:12 PM
> > 
> > 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: [mg8755] [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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