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MathGroup Archive 2007

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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
>
>
>
>



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