[Maxima-bugs] [ maxima-Bugs-2919296 ] binomial sums

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Bugs item #2919296, was opened at 2009-12-22 12:51
Message generated for change (Comment added) made by andrejv
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Nobody/Anonymous (nobody)
Summary: binomial sums

Initial Comment:
wanted to use this in my teaching but...

load(simplify_sum);
sum(binomial(n,x)*p^x*(1-p)^(n-x),x,0,n);
simplify_sum(%)
0
sum(binomial(n,x)*0.3^x*(1-0.3)^(n-x),x,0,n);
simplify_sum(%);
rat: replaced 0.3 by 3/10 = 0.3
rat: replaced 0.7 by 7/10 = 0.7
rat: replaced 0.7 by 7/10 = 0.7
 1

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>Comment By: Andrej Vodopivec (andrejv)
Date: 2009-12-22 15:57

Message:
This is a bug in the implementation of the Gosper algorithm from the
Zeilberger package. A workaround for simplify_sum is to set
Gosper_in_Zeilberger to false.

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You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=104933&aid=2919296&group_id=4933