Re: finding independent variable groups
- To: mathgroup at smc.vnet.net
- Subject: [mg32431] Re: finding independent variable groups
- From: "Allan Hayes" <hay at haystack.demon.co.uk>
- Date: Sat, 19 Jan 2002 19:03:33 -0500 (EST)
- References: <firstname.lastname@example.org>
- Sender: owner-wri-mathgroup at wolfram.com
Assuming that you do not want the expression to evaluate before determining
or acting at the positions, here are two suggestions (I have added an extra
Rest/@Position[Hold[(x/y) Exp[z x/y]],x/y]
Hold[(x/y) Exp[z x/y]]/.x/y->u
Now remove Hold
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"Ioan Alexandre Romoscanu" <romoscanu at imes.mavt.ethz.ch> wrote in message
news:a2b3mv$lhd$1 at smc.vnet.net...
> I wonder if it is possible to do the following formula manipulation
> task with Mathematica.
> Suppose you have a function of 3 variables [x,y,z], where only the
> ratio x/y occurs. Example
> f[x_,y_,z_]=(x/y) Exp[z]
> If now you have a large formula of more than 3 variables, where
> however certain variables always occur grouped together, in the same
> pattern (like x and y above).
> Is there a way to make Mathematica find out such groups of variables
> in a larger expression?
> Thank you for any help
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