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Re: why no result & no error from this recursion

  • To: mathgroup at smc.vnet.net
  • Subject: [mg82459] Re: why no result & no error from this recursion
  • From: Szabolcs Horvát <szhorvat at gmail.com>
  • Date: Sat, 20 Oct 2007 06:03:34 -0400 (EDT)
  • References: <ff9t3q$6bp$1@smc.vnet.net>

Murray Eisenberg wrote:
> Why does the following recursion produce neither a result nor an error 
> message -- nor a system crash?

Well, Mathematica should NOT crash the entire system!

> 
> Block[{$RecursionLimit=50002}, (If[#<1, "", "." <> #0[# - 1]] &)[50000]]
> 
> I even tried setting $RecursionLimit=Infinity, but no change.

On my system (WinXP), the kernel quits with no error message when the 
stack space is exhausted.  I don't know how a "crash" is defined 
precisely, but the consequences of the kernel quitting unexpectedly are 
the same, no matter if there is an "Application error" dialogue box, or 
there isn't.

> 
> I presume this is just bumping up against a hardware/OS limit, so I'm 
> surprised to get no error message and no crash.
> 

-- 
Szabolcs


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