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Re: Map[] and multiple args function

  • To: mathgroup at smc.vnet.net
  • Subject: [mg96357] Re: Map[] and multiple args function
  • From: Yannan <lumeng at gmail.com>
  • Date: Thu, 12 Feb 2009 06:36:29 -0500 (EST)
  • References: <gmp0ps$c0a$1@smc.vnet.net>

In[10]:= SetAttributes[Foo, Listable]
Foo[x_, y_, z_] := x + 2*y + 3*z
Foo[{1, 1, 1}, {2, 2, 2}, {3, 3, 3}]
Foo[{1, 2, 3}, {2, 3, 4}, {4, 5, 6}]

Out[12]= {14, 14, 14}

Out[13]= {17, 23, 29}


On Feb 9, 4:33 am, sagra... at gmail.com wrote:
> I know this has to be FAQ, but I'm just not able to find an answer
> anywhere, so - here it goes:  I have a multiple-arguments function,
> say something like:
>    Foo[x_, y_, z_] := x + 2*y + 3*z
> Now, I want to call this function number of times, over different sets
> of arguments, and then to sum results.  I thought about storing
> argument triplets into some kind of list, and then employing sequence
> of Map[] and Apply[] to get the job done.  After number of trials and
> errors, I came up with following piece of code doing the thing:
>   Plus @@ Foo /@ {{1, 2, 3}, {4, 5, 6}} /. List -> Sequence
> but I even don't fully understand what's going here, and also I'm
> wondering is there a "better" way to accomplish this.  So - any
> suggestion?
>
> Thanks.



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