Re: A Functional Programming Question

• To: mathgroup at smc.vnet.net
• Subject: [mg24707] Re: A Functional Programming Question
• From: "Rasmus Debitsch" <debitsch at Zeiss.de>
• Date: Wed, 9 Aug 2000 02:31:07 -0400 (EDT)
• References: <8mdm9v\$5o7@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

```Hello,

I haven't find a way to avoid MapThread. But with MapThread :

eqns = {a x + d y == 3a, b y == 0, c z == 0, e x == b e y == a z}

MapThread[Equal @@ Simplify /@ ((List @@ #1)/#2) &, {eqns, {a, b, c, e}}]

will work.

Regards
--

Rasmus Debitsch
Carl Zeiss Lithos GmbH
Carl Zeiss Strasse
D-73447 Oberkochen

eMail : debitsch at zeiss.de

David Park <djmp at earthlink.net> schrieb in im Newsbeitrag:
8mdm9v\$5o7 at smc.vnet.net...
> 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
>
>
>

```

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