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Re: Map[] and multiple args function

  • To: mathgroup at smc.vnet.net
  • Subject: [mg96277] Re: Map[] and multiple args function
  • From: dh <dh at metrohm.com>
  • Date: Tue, 10 Feb 2009 05:56:17 -0500 (EST)
  • References: <gmp0ps$c0a$1@smc.vnet.net>


Hi,

try:

{{1, 2, 3}, {4, 5, 6}} /. List -> Sequence

and you will see that it does not what you want. You may use Thread or 

MapThread to do what you want:

Thread[foo[{1, 2, 3}, {4, 5, 6}]]

MapThread[foo, {{1, 2, 3}, {4, 5, 6}}]



hope this helps, Daniel



sagrailo 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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