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MathGroup Archive 2004

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Re: Mathematica 5: Integration bug in quadratic found by the GEMM machine

  • To: mathgroup at smc.vnet.net
  • Subject: [mg46918] Re: Mathematica 5: Integration bug in quadratic found by the GEMM machine
  • From: lalu_bhatt at yahoo.com (Bhuvanesh)
  • Date: Tue, 16 Mar 2004 02:37:21 -0500 (EST)
  • References: <c33da8$fsi$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Vladimir Bondarenko <vvb at mail.strace.net> wrote:
> $Version
> 
> 5.0 for Microsoft Windows (June 11, 2003)
> 
> Integrate[1/(-2 z^2 + 3 z - 1), {z, -1, 0}]
> 
> Log[3/2]     // invalid answer
> 
> 0.405465
> 
> NIntegrate[1/(-2*z^2 + 3*z - 1), {z, -1, 0}]
> 
> -0.405465

This is fixed in version 5.0.1.

In[1]:= {$Version, $ReleaseNumber}

Out[1]= {5.0 for Linux (November 18, 2003), 1}

In[2]:= Integrate[1/(-2 z^2 + 3 z - 1), {z, -1, 0}]

             3
Out[2]= -Log[-]
             2

In[3]:= N[%]

Out[3]= -0.405465

--
Bhuvanesh,
Wolfram Research.

Disclaimer: Any opinions expressed herein are my own and not
necessarily those of Wolfram Research.


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