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

• To: mathgroup at smc.vnet.net
• Subject: [mg128095] Re: Substitute variable name for value (reverse of simplification)
• From: daniel.lichtblau0 at gmail.com
• Date: Sat, 15 Sep 2012 03:38:19 -0400 (EDT)
• Delivered-to: l-mathgroup@mail-archive0.wolfram.com
• Delivered-to: l-mathgroup@wolfram.com
• Delivered-to: mathgroup-newout@smc.vnet.net
• Delivered-to: mathgroup-newsend@smc.vnet.net
• References: <k2ub90\$ha5\$1@smc.vnet.net>

```On Thursday, September 13, 2012 11:20:59 PM UTC-5, mr.h... 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?

Check the dox for PolynomialReduce.

In[68]:= PolynomialReduce[189*a^3, var1 - 3*a, {a, var}][[2]]

Out[68]= 7*var1^3

Daniel Lichtblau
Wolfram Research

```

• Prev by Date: Re: primitive root error
• Next by Date: Re: primitive root error
• Previous by thread: Re: Substitute variable name for value (reverse of simplification)
• Next by thread: primitive root error