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/