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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: [mg35288] RE: [mg35267] Yet another Version 4.2 Integration howler
  • From: "DrBob" <majort at cox-internet.com>
  • Date: Sat, 6 Jul 2002 05:44:57 -0400 (EDT)
  • Reply-to: <drbob at bigfoot.com>
  • Sender: owner-wri-mathgroup at wolfram.com

It comes out to zero on my machine...

$Version
"4.2 for Microsoft Windows (June 5, 2002)"

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

I'm using Windows XP Home on a Gateway 700XL, 1024MB RAM, Pentium 4
2.2GHz.

Surely this isn't a chip issue?!?

Bobby Treat

-----Original Message-----
From: Vladimir Bondarenko [mailto:vvb at mail.strace.net] 
To: mathgroup at smc.vnet.net
Subject: [mg35288] [mg35267] Yet another Version 4.2 Integration howler

........................................................................
......

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







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