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Re: Wolfram, meet Stefan and Boltzmann

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  Re: Wolfram, meet Stefan and Boltzmann Daniel Lichtblau <danl@wolfram.com> - 2011-04-02 07:52 +0000
    Re: Wolfram, meet Stefan and Boltzmann AES <siegman@stanford.edu> - 2011-04-02 22:05 +0000

#1413 — Re: Wolfram, meet Stefan and Boltzmann

Peter Pein wrote:
> Am 31.03.2011 11:03, schrieb Curtis Osterhoudt:
>> Again, this happens on Linux, too. It's not limited to OS X
>>
>> In[1]:= 1 + 1
>>
>> Out[1]= 2
>>
>> In[2]:= $Version
>>
>> Out[2]= "7.0 for Linux x86 (32-bit) (November 11, 2008)"
>>
>> In[3]:= AbsoluteTiming[Integrate[x^3/(Exp[x] - 1), {x, 0, Infinity}]]
>>
>> Out[3]= {15.64583`7.645943600598422, \[Pi]^4/15}
> ...
> sorry, I can not reproduce your results:
> In[1]:= 1+1
> $Version
> $ReleaseNumber
> AbsoluteTiming[Integrate[x^3/(Exp[x]-1),{x,0,Infinity}]]
> 
> 
> Out[1]= 2
> Out[2]= 8.0 for Microsoft Windows (64-bit) (February 23, 2011)
> Out[3]= 1
> Out[4]= {1.6692030,\[Pi]^4/15}
> 
> and similar results under Linux
> 
> maybe a clean reinstall (uninstall Mathematica, reboot, install Mathematica) might help?

Not needed. I can reproduce the result (the bad timing) in version 7. It 
got faster in version 8.

Daniel Lichtblau
Wolfram Research

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#1444

In article <in6kj6$2jq$1@smc.vnet.net>,
 Daniel Lichtblau <danl@wolfram.com> wrote:

> Not needed. I can reproduce the result (the bad timing) in version 7. It 
> got faster in version 8.
> 
> Daniel Lichtblau
> Wolfram Research

Again, my apologies, as the OP on this extended thread.  When I first 
got the 19 second timing on evaluating this integral I believed I was 
running version 8, but I was actually still running version 7, for which 
this is apparently the correct (if somewhat surprisingly long) timing.  
I'll spare you the details of how my original error happened.   --AES

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