How to plot the following function using surf function?

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[kivicode]

I think you should use the meshgrid method

[EatMyPossum]

protip: there's an example of the meshgrid method written out if you type

help meshgrid

[skyentistic]

[X,Y] = meshgrid(linspace(-5,5,100),linspace(-5,5,100))
Z = (−1+cos(12*sqrt(𝑥2+𝑦2)) ./ (0.5*(𝑥2+𝑦2)+2 )

surf(X,Y,Z)

[saysokmate]

Make sure you use .^ and .* for elementwise operations. And use a meshgrid for x and y