[Maxima-bugs] [ maxima-Bugs-788882 ] factcomb issues

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Bugs item #788882, was opened at 2003-08-14 14:47
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Stavros Macrakis (macrakis)
Assigned to: Nobody/Anonymous (nobody)
Summary: factcomb issues

Initial Comment:
factcomb( 4 * (-1)! ) gives Quotient by zero error, 
though factcomb( (-1)! ) gives no error, and for that 
matter there is no way factcomb can combine 4 and (-
1)!.

factcomb((-1)! / (-2)!) gives a floating-point exception 
(floating point???).

The doc for factcomb gives the example of factcomb
((N+1)^B*N!^B).  First of all, the documentation (both 
in the Info file and in Describe) is cut off before the 
matching D-line, which presumably should have (n+1)!
^b.  Secondly, factcomb does not in fact perform that 
combination.

I tried loading in the source for combin.lisp to debug, 
and many of the above examples now return 1 instead of 
either the error or the correct answer.  minfactorial((-
1)! / (-2)!) gives Error: The variable *FACTLIST is 
unbound.

Maxima 5.9.0 gcl 2.5.0 mingw32 Windows 2000 Athlon


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