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MathGroup Archive 2000

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Re: A Functional Programming Question

  • To: mathgroup at smc.vnet.net
  • Subject: [mg24744] Re: A Functional Programming Question
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Wed, 9 Aug 2000 02:31:50 -0400 (EDT)
  • Organization: Universitaet Leipzig
  • References: <8mdm9v$5o7@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,


Transpose[{{a, b, c}, eqns}] /. {b_, a_Equal} :> (#/b & /@ a)


#2*#1^(-1) & @@@ Transpose[{{a, b, c}, eqns}] /. a_Equal/b_ :> (#/b & /@
a)

?

Other more cryptic soutions are welcome.

Regards
  Jens

David Park wrote:
> 
> Dear MathGroup,
> 
> Suppose I have three equations.
> 
> eqns = {a x == 0, b y == 0, c z == 0};
> 
> I want to divide out the constants a, b, and c. I can do it this way:
> 
> eqns[[1]] = (#1/a & ) /@ eqns[[1]];
> eqns[[2]] = (#1/b & ) /@ eqns[[2]];
> eqns[[3]] = (#1/c & ) /@ eqns[[3]];
> eqns
> 
> {x == 0, y == 0, z == 0}
> 
> Is there a simpler method for doing the calculation in one statement with
> functional programming, say using MapThread over eqns and {a,b,c}? Is there
> any other simple approach?
> 
> David Park
> djmp at earthlink.net
> http://home.earthlink.net/~djmp/


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