legending - Plotting legends in contourplot

In Mathematica 8.

Given this:

f[x_, y_, z_] := z - x^2 - y^2 (*relation among the variable f[x,y,z]==0*)
parameter = Range[0.1, 1, 0.1];(*choice of parameter values*)

I'm trying to plot the level curves

ContourPlot[Evaluate@Table[f[x, y, z] == 0, {z, parameter}], {x, -1, 1}, {y, -1,1}, PlotLegends -> parameter]

I have the next error message:

ContourPlot::optx: "Unknown option PlotLegends in ContourPlot[{0.1 -x^2-y^2==0,0.2 -x^2-y^2==0,0.3 -x^2-y^2==0,0.4 -x^2-y^2==0,0.5 -x^2-y^2==0,0.6 -x^2-y^2==0,0.7 -x^2-y^2==0,0.8 -x^2-y^2==0,0.9 -x^2-y^2==0,1. -x^2-y^2==0},{x,-1,1},{y,-1,1},PlotLegends->parameter]"

I tried using:

Needs["PlotLegends`"]

ShowLegend[ 
  ContourPlot[Evaluate@Table[f[x, y, z] == 0,
    {z, parameter}], {x, -1, 1}, {y, -1,1}, PlotLegends -> parameter] ]

what I should do?

Comments

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