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MathGroup Archive 2007

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Re: About function to evaluation

  • To: mathgroup at smc.vnet.net
  • Subject: [mg74484] Re: About function to evaluation
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Fri, 23 Mar 2007 18:59:33 -0500 (EST)
  • Organization: Uni Leipzig
  • References: <ett7mp$ifv$1@smc.vnet.net>
  • Reply-to: kuska at informatik.uni-leipzig.de

Hi,

f[x_, y_] := 2x + 3y

data /. {y_, x_, _} :> {x, y, f[x, y]}

or

data /. {xy__, 0} :> {Sequence @@ Reverse[{xy}], f @@ Reverse[{xy}]}

??
or

Append[Reverse[Take[#, 2]], f @@ Reverse[Take[#, 2]]] & /@ data

Regards
   Jens
Evanescence wrote:
> Hello Dear all:
> My questions are as follows:
> First I definite a function is f[x_,y_]:=2x+3y
> Then I have a list is data={{1,2,0},{2,3,0},{4,1,0},{6,3,0},{1,3,0}}
> For example{y,x,z}={1,2,0}    {y,x,z}={2,3,0}  {y,x,z}={4,1,0}
> {y,x,z}={6,3,0} {y,x,z}={1,3,0}
> I want to take the list data to the function to get the function
> values.
> Then express the form as follows at last
> 
>    x     y     f[x,y]
>    2     1       7
>    3     2      12
>    1     4      14
>    3     6      24
>    3     1       9
> 
> PS: The z values is zero overall.
> Please tell me how to get the function values in the list
> Thank you very much
> Evanescence 2007 03 21
> 
> 


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