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beginner plot function with parameter


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





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