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MathGroup Archive 2005

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Re: Integrate problem?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg62149] Re: Integrate problem?
  • From: Bill Rowe <readnewsciv at earthlink.net>
  • Date: Sat, 12 Nov 2005 03:33:00 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

On 11/11/05 at 2:51 AM, mm01 at danfoss.com (Martin Manscher) wrote:

>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?

What version are you using. Here

In[3]:=
Integrate[Sin[t] Sign[Sin[0.999 t]], {t, 0, 2 Pi}]
Out[3]=3.999990110634892

In[4]:=
NIntegrate[Sin[t] Sign[Sin[0.999 t]],{t, 0, 2 Pi}]
Out[4]=3.999990110634892

In[9]:=$Version
Out[9]="5.2 for Mac OS X (June 20, 2005)"
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