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Re: NIntegrate & Integrate

  • To: mathgroup at smc.vnet.net
  • Subject: [mg100102] Re: NIntegrate & Integrate
  • From: Erik Max Francis <max at alcyone.com>
  • Date: Mon, 25 May 2009 06:13:33 -0400 (EDT)
  • References: <gv7r1l$asp$1@smc.vnet.net>

Bill Rowe wrote:
> On 5/22/09 at 1:47 AM, kzhuravl at mtu.edu (Konstantin) wrote:
>> My output is:
> 
>> 3.21059(NIntegrate)
>> -3.21059(Integrate)
> 
>> The right answer is -3.21059.
> 
>> Why does NIntegrate gave me wrong answer?
> 
> I cannot reproduce your results above. I get the correct value
> by simply pasting your code up to the line for NIntegrate into a
> fresh session. That is:
> 
> In[1]:= {a, b} = {8.76, 4.56};
> NIntegrate[2*Cos[x], {x, a, b}]
> 
> Out[2]= -3.21059
> 
> In[3]:= $Version
> 
> Out[3]= 7.0 for Mac OS X x86 (64-bit) (February 19, 2009)

I also get the right answer on:

In[6]:= $Version

Out[6]= "7.0 for Linux x86 (32-bit) (January 30, 2009)"

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