How to plot contour?
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Have 3 random variables, but need to plot in two dimensions.
Here is the function.
f=1+2*r1*cos(omega)+2*r2*cos(2*omega).
X axis: r1 [-1,1]
Y axis: r2 [-1,1]
Plot the contour which makes f>=0 for all omegas. In other words, plot the contour which makes the minimum value of f is 0.
Apparently, (-0.5,0), (0.5,0), (0,0.5), (0,-0.5) are four points on the contour.
Thanks in advance.
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