Re: Dot or Inner ... but not quite
- To: mathgroup at smc.vnet.net
- Subject: [mg79637] Re: [mg79622] Dot or Inner ... but not quite
- From: "Thomas Dowling" <thomasgdowling at gmail.com>
- Date: Wed, 1 Aug 2007 04:52:19 -0400 (EDT)
- References: <200707311013.GAA21053@smc.vnet.net>
Why not just l1 l2 {{1, 7}, {4, 36}, {15, 6}} or am I missing something? (#[[1]]*#[[2]]) & /@ Transpose[{l1, l2}] {{1, 7}, {4, 36}, {15, 6}} On 7/31/07, Diamond, Mark <dot at dot.dot> wrote: > > 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 > > > >