No, someone pointed out ratsubst which is better I guess
(%i1) 2*p+2*m*k=y$ratsubst(p, m*k,%);
(%o2) 4*p=y
Thanks anyway,
Rich
------------Original Message------------
From: Sheldon Newhouse <sen1 at math.msu.edu>
To: "Richard Hennessy" <rvh2007 at comcast.net>
Cc: "Maxima List" <maxima at math.utexas.edu>
Date: Wed, Sep-3-2008 0:27 AM
Subject: Re: [Maxima] subst problems
Richard Hennessy wrote:
> Does anyone know a better command than subst for changing variables in expressions not containing integrate? I can't get subst to work right sometimes.
>
> (%i1) 2*p+2*m*k=y$
> (%i2) subst(p, m*k);
> (%o2) 2*p+2*m*k=y
>
> It has no affect.
>
> Rich
>
>
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> Maxima at math.utexas.edu
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>
>
Is this what you want?
(%o14) 2*p+2*k*m = y
(%i15) subst(m=p^(1/2),subst(k=p^(1/2),%o14));
(%o15) 4*p = y
-sen
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