How to plot 3D surface plot for given x and y data? what is code for z?

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Isha Deshpande 2013-4-29

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https://ww2.mathworks.cn/matlabcentral/answers/73949-how-to-plot-3d-surface-plot-for-given-x-and-y-data-what-is-code-for-z

{x = [1,2,3,77,5]; y = [22,13,2,4,5]; z = peaks(y); surf(x,y,z);}

In above code x stands for frequency and y stands for voltage, here I required 3 D surface plot representation where highest value of y axis forms peak at certain height represented by z axis. Hence, what is the correct code for z axis so that I will get surface representation of 2 D xy plot?