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Re: Integrate problem?


Presumably your p is Pi

$Version

5.2 for Mac OS X (June 20, 2005)

Integrate[Sin[t]Sign[Sin[.999t]],{t,0,2Pi}]

3.999990110634892

Integrate[Sin[t]Sign[Sin[999t/1000]],{t,0,2Pi}]

-2*(-1 + Cos[(1000*Pi)/999])

%//N

3.999990110634892

NIntegrate[Sin[t]Sign[Sin[.999t]],{t,0,2Pi}]

3.999990110634892


Bob Hanlon

> 
> From: "Martin Manscher" <mm01 at danfoss.com>
To: mathgroup at smc.vnet.net
> Date: 2005/11/11 Fri AM 02:51:53 EST
> Subject: [mg62128] [mg62090] Integrate problem?
> 
> In[48]:=
> Integrate[Sin[t]Sign[Sin[.999t]],{t,0,2p}]
> 
> Out[48]=
> 2. - 1.91585*10^-14 I
> 
> In[49]:=
> NIntegrate[Sin[t]Sign[Sin[.999t]],{t,0,2p}]
> 
> Out[49]=
> 4.
> 
> Why?
> /Martin
> 
> 


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