Thanks, that did the trick.
------------Original Message------------
From: Barton Willis <willisb at unk.edu>
To: "Richard Hennessy" <rvh2007 at comcast.net>
Cc: "Maxima List" <maxima at math.utexas.edu>, maxima-bounces at math.utexas.edu
Date: Wed, Apr-30-2008 3:29 PM
Subject: Re: [Maxima] Sumcontract Does Not Do This
maxima-bounces at math.utexas.edu wrote on 04/30/2008 01:11:11 PM:
> If I enter
>
> expr1: sum(a[i]*x^i,i,1,inf)+sum(c[i]*x^i,i,1,inf);
>
> then sumcontract will pull everything inside one sum.
>
> If I enter
>
> expr2: A*sum(a[i]*x^i,i,1,inf)+B*sum(c[i]*x^i,i,1,inf);
>
> then sumcontract has no effect.
Try using intosum:
(%i25) A*sum(a[i]*x^i,i,1,inf)+B*sum(c[i]*x^i,i,1,inf)$
(%i26) map('intosum,%)$
(%i27) sumcontract(%);
(%o27) sum(c[i]*x^i*B+a[i]*x^i*A,i,1,inf)
Barton