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