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I want to plot some functions f(x,y) including singularities. For example; f(x,y)=tan(x-y)

  • In Matlab, when I run the following code

syms x y; func=@(x,y) tan(x-y); fsurf(@(x,y) func(x,y), [-4 2 -1 1]);

I get

enter image description here

  • In Mathematica, when I plot the same function, I can remove the discontinuities using Exclusions -> "Singularities"

enter image description here

My question: In MATLAB, how to remove vertical asymptote lines in Matlab's figure like Mathematica?

-How to find the asymptote lines in Matlab. After finding the asymptote, maybe we make it invisible in the plot.

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    $\begingroup$ Did you try clipping the z value in Matlab to e.g. (staying with your Mathematica example) [-5, 5] ? If you need it for a general case, you could try to clip the values to some multiplicity of the mean value(assuming the mean is not too corrupted). $\endgroup$
    – Dan Doe
    Jan 6 at 9:23
  • $\begingroup$ That will not help because MATLAB interpolates across the discontinuity. The singularities should be detected (as in Mathematica) and the numerical data could be plotted piecewise. $\endgroup$ Jan 6 at 10:50

1 Answer 1

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MATLAB doesn’t plot where there are NaNs, so you can replace some of your data with NaNs to make a clean jump.

I don’t know which is a bigger lie, a clean jump or a strange wiggle. That’s up to your eye and values.

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