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MathGroup Archive 2005

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Re: Integral problem

  • To: mathgroup at smc.vnet.net
  • Subject: [mg58318] Re: [mg58309] Integral problem
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Tue, 28 Jun 2005 05:13:18 -0400 (EDT)
  • Reply-to: hanlonr at cox.net
  • Sender: owner-wri-mathgroup at wolfram.com

expr=Rationalize[
      0.5*(1+10^7*((1-x-y)/1.5+x/8)^10)+
        0.004*x/((1-x-y)/1.5+x/8)^10];

Integrate[expr,{x,425/10000,1999/10000},
    {y,8425/10000-x,8/10}]//N

1.9153852813471046*^8


Bob Hanlon

> 
> From: HUAFANG CUI <huafangc at seas.upenn.edu>
To: mathgroup at smc.vnet.net
> Date: 2005/06/26 Sun PM 11:13:11 EDT
> Subject: [mg58318] [mg58309]  Integral problem
> 
> Hi,
> 
> I have a question about integral.  I could not figure out what is wrong.
> 
> function is
> 0.5 * (1 + 10^7 * ((1-x-y)/1.5 + x/8)^10) + 0.004 * x / ((1-x-y)/1.5 + 
> x/8)^10)
> 
> limit on y is
> 0.8425 - x, 0.8
> 
> limit on x is
> 0.0425, 0.1999
> 
> I run it on Ver4.0.  It runs forever and does not stop.
> 
> Thank you.
> 
> HC
> 
> 


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