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MathGroup Archive 2002

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Re: Yet another Version 4.2 Integration howler

  • To: mathgroup at smc.vnet.net
  • Subject: [mg35364] Re: Yet another Version 4.2 Integration howler
  • From: Daniel Lichtblau <danl at wolfram.com>
  • Date: Tue, 9 Jul 2002 06:50:34 -0400 (EDT)
  • References: <200207050620.CAA07180@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Vladimir Bondarenko wrote:
> 
> ..............................................................................
> 
> BUG # 3617
> 
> For an expression having a concrete numeric value,  Indeterminate is reported
> 
> BUG HISTORY:    PRESENT   4.2 for Microsoft Windows (February 28, 2002)
>                 ABSENT    4.1 for Microsoft Windows (November 2, 2000)
>                 ABSENT    4.0 for Microsoft Windows (April 21, 1999)
>                 ABSENT    Microsoft Windows 3.0 (April 25, 1997)
>                 ABSENT    Windows 387 2.2 (April 9, 1993)
> 
> Reproducible    Always
> BuildNumber     156656
> CPU ID          AuthenticAMD AMD Athlon(tm) XP 1600+
> RAM size        512 Mb
> Free HDD size   11  Gb
> OS ID           Microsoft Windows 98 4.10.2222 A
> 
> The value of the integral is defined.
> However, Mathematica reports  Indeterminate  which is invalid.
> 
>                 Integrate[Log[z]/(1 + z^2), {z, 0, Infinity}]
> 
> ACTUAL:         Indeterminate
> 
> EXPECTED:       0
> 
> CHECK-UP:       NIntegrate[Log[z]/(1 + z^2), {z, 0, Infinity}] // Chop
> 
>                 0
> 
> ..............................................................................
> 
> Best,
> 
> Vladimir Bondarenko


In[1]:= Integrate[Log[z]/(1 + z^2), {z, 0, Infinity}]
Out[1]= 0

In[2]:= $Version
Out[2]= 4.2 for Linux (July 8, 2002)

What is the point of sending the news group notices of "bugs" from a
beta version of the software?

Daniel Lichtblau
Wolfram Research


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