[Maxima-bugs] [ maxima-Bugs-686116 ] binomial

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Bugs item #686116, was opened at 2003-02-13 12:49
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=104933&aid=686116&group_id=4933

Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Barton Willis (willisb)
Assigned to: Nobody/Anonymous (nobody)
Summary: binomial

Initial Comment:
The binomial function (defined in mlisp.lisp) sets $float
and $numer to true.  This can cause $binomial 
to return a decimal approximation when a rational
is expected;  consider 

------ file bug.lisp--------------------------------

(defun $unk (a b)
  ($binomial a b))
--------------------------------------------------------


(C1) load("l:/maxima-bugs/bug.lisp")$

(C2) unk(21/5,4);
(D2) 				    1.4784
(C3) display2d : false$

(C4) binomial(21/5,4);
(D4) 924/625

Calling binomial from a Maxima function doesn't
use the binomial function defined in mlisp; for
example,

(C5) foo(a,b) := block([], binomial(a,b))$
(C6) foo(21/5,4);
(D6) 924/625

I seen no reason for $binomial in mlisp to set $float
or $numer to true; I suggest that we try removing
these assigments.

Barton 
 



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You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=104933&aid=686116&group_id=4933