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MathGroup Archive 2004

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Re: definite and indefinite Integrate

  • To: mathgroup at smc.vnet.net
  • Subject: [mg50449] Re: [mg50428] definite and indefinite Integrate
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Sat, 4 Sep 2004 01:43:27 -0400 (EDT)
  • Reply-to: hanlonr at cox.net
  • Sender: owner-wri-mathgroup at wolfram.com

ff[z_]=1/z+z^3;

Use GenerateConditions -> False and reverse the order of your limits.

Integrate[ff[z],{z,y0,y}, GenerateConditions->False]

y^4/4 - y0^4/4 + Log[y] - Log[y0]


Bob Hanlon

> 
> From: Jun Yan <jyan at stat.wisc.edu>
To: mathgroup at smc.vnet.net
> Date: 2004/09/03 Fri AM 03:35:23 EDT
> To: mathgroup at smc.vnet.net
> Subject: [mg50449] [mg50428] definite and indefinite Integrate
> 
> This is a question from a beginner:
> 
> ff[z_] = 1/z + z^3
> Integrate[ff[z], {z, y, y0}]
> intff[z_] = Integrate[ff[z], z]
> intff[y] - intff[y0]
> 
> I expected to get same results from line 2 and line 4. However, the output
> from line 2 is very complicated, with an If which has Im(y) and Im(y0)
> involved. The result I want is that from line 4. How can I modify line 2
> so that it produces the same output as from line 4?
> 
> Thanks.
> 
> Jun
> 
> 


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