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beginner plot function with parameter

• To: mathgroup at smc.vnet.net
• Subject: [mg74021] beginner plot function with parameter
• From: "Wei Li" <wei_li92 at hotmail.com>
• Date: Tue, 6 Mar 2007 05:30:56 -0500 (EST)

Dear Mathgroup,

I am using mathematica 5 to plot a function with some parameter, I want to 
plot for example a simple parabolic function with positive parameter s:

f[z_]:=(z/s)^2;
Plot[f[z],{z,-s,s}];

mathematica code doesn't seem to work, anyone can help?

Thanks!

Wei