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Plotting

• To: mathgroup at smc.vnet.net
• Subject: [mg72987] Plotting
• From: "Rayne" <ghcgwgwg at singnet.com.sg>
• Date: Sat, 27 Jan 2007 06:37:48 -0500 (EST)

Hi all,
I want to plot the cubic equation f(x) == x^3 - 16x^2 + 3x + 1 == 0. I had:

f==x^3-16 x^2+3 x+1 ==== 0
Plot[f,{x,-1,20}]

but I was unable to get the plot. The error message says

Plot::plnr: f is not a machine-size real number at x == -0.999999.
Plot::plnr: f is not a machine-size real number at x == -0.148093.
Plot::plnr: f is not a machine-size real number at x == 0.780985.
General::stop: Further output of Plot::plnr
     will be suppressed during this calculation.

How do I get around this problem?

Thank you.

Regards,
Rayne