Sum expansion
- To: mathgroup at smc.vnet.net
- Subject: [mg32630] Sum expansion
- From: Cyril Fischer <fischerc at itam.cas.cz>
- Date: Fri, 1 Feb 2002 02:02:33 -0500 (EST)
- Organization: Inst. of Theoretical and Applied Mechanics
- Sender: owner-wri-mathgroup at wolfram.com
I would like to arrange exression
A Sum [ B_i ,{i,1,s}]
into expression
Sum [ A B_i, {i,1,s} ]
Following transformation code gives unwanted answer:
A*Sum[Subscript[B, i], {i, 1, s}] /.
a_*Sum[b_, {i, 1, s}] -> Sum[a*b, {i, 1, s}]
Result is
A s Bi
I understand, why it behawes this way, but I dont know the correct way.
Thanks for your hints,
Cyril