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rules->function

• To: mathgroup at smc.vnet.net
• Subject: [mg7338] rules->function
• From: Lord of Darkness <j.biddiscombe at rl.ac.uk>
• Date: Tue, 27 May 1997 22:27:18 -0400 (EDT)
• Organization: Rutherford Appleton Laboratory
• Sender: owner-wri-mathgroup at wolfram.com

Hello All,

If I solve a set of simultaneous equations and get a simple answer like
zrule = z-> x^2 + y^2

but I then want to evaluate
fn[x_,y_] := z + some more stuff.....

I tried saying

fn[x_,y_] := Replace[z,zrule] + ....

but it doesn't seem to handle it the way I wanted...

Is there a correct way of doing this ?

thanks

John B