How to plot level curves

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Irene Zhou
Irene Zhou on 23 Nov 2020
I have an equation Z = exp(-0.5.*((X-800)./40).^2).*cos(2*pi.*Y*1000./X).
I want to plot level curves of Y from -100 to 100 against X from 700 to 900 for Z = -1 to 1. The graph is supposed to look like the one below.
I have tried surf but it's ignoring the axis limits I set. I also don't know how to set Z to different values.
[X,Y] = meshgrid(700:1:900,-100:1:100);
Z = exp(-0.5.*((X-800)./40).^2)*cos(2*pi.*Y*1000./X);
surf(Z)
Any help is appreciated!

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