Dot or Inner ... but not quite
- To: mathgroup at smc.vnet.net
- Subject: [mg79622] Dot or Inner ... but not quite
- From: "Diamond, Mark" <dot at dot.dot>
- Date: Tue, 31 Jul 2007 06:13:49 -0400 (EDT)
I have two equi-length lists, the first of number, the second of
(equi-length) lists of numbers , such as
l1={1,4,3};
l2={{1,7},{1,9},{5,2}};
I want to produce 1*{1,7}+4*{1,9}+3*{5,2}
It looks so close to Inner that I thought I could use it in some form, but I
have ended up using
(#[[1]]*#[[2]])& /@ Transpose[{l1,l2}]
Is there a better way using one of the builtin functions with which I am
unfamiliar?
Cheers,
Mark Diamond