       Re: Substitute variable name for value (reverse of simplification)

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• Subject: [mg128092] Re: Substitute variable name for value (reverse of simplification)
• From: Bob Hanlon <hanlonr357 at gmail.com>
• Date: Sat, 15 Sep 2012 03:37:19 -0400 (EDT)
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• References: <20120914042155.1296B676B@smc.vnet.net>

```Clear[var1]

var2 = 189*a^3;

Simplify[var2, var1 == 3*a]

7 var1^3

var2 /. a -> var1/3

7 var1^3

var2 /. Solve[var1 == 3*a, a][]

7 var1^3

Bob Hanlon

On Fri, Sep 14, 2012 at 12:21 AM,  <mr.hagak at gmail.com> wrote:
> I need this to happen:
> var1 = 3*a
> var2 = 189*a^3
> output = 7*var1^3
>
> I can do it in very simple and specific equations doing something like
>
> substituteName2[var_,exp_] := Module[ {},
>         Solve[p==exp&&"test"==var,{p},{a}]
> ];
> test=3*a;
> substituteName2[test,7*test^3]
>
> But i need a WAY more general form of that...any ideas?
>

```

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