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Mathematica bugs?

• To: mathgroup at smc.vnet.net
• Subject: [mg67301] Mathematica bugs?
• From: "Yaroslav Bulatov" <yaroslavvb at gmail.com>
• Date: Sat, 17 Jun 2006 04:36:17 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

When I run the following line
x = Pi/4; For[i = 0, i < 56, i += 1, x = 2*Abs[x - 1/2]]; N[x]
I get
3.

But x should always stay between 0 and 1, why do I get 3?

Also
x = Pi/4; For[i = 0, i < 50, i += 1, x = 2*Abs[x - 1/2]]; N[Log[x]]
gives me
Indeterminate

How can I get an indeterminate here?

• Follow-Ups:
  • Re: Mathematica bugs?
    • From: "Carl K. Woll" <carlw@wolfram.com>
  • Re: Mathematica bugs?
    • From: Andrzej Kozlowski <akoz@mimuw.edu.pl>