How to create a line passing through the inner boundary of the point set shown in the image?

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Ganesh Nayak 2019-6-12

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https://ww2.mathworks.cn/matlabcentral/answers/466716-how-to-create-a-line-passing-through-the-inner-boundary-of-the-point-set-shown-in-the-image

I have several points with (X,Z) coordinates in a txt file. I have read all the point into column matrix X and Z. Then I plotted a 2D scatter plot. The blue dots are the points with Xand Z coordinates. I want to create a line (which is shown in red) passing through the inner boundary of points?

I tried the follwing code. the result shown below is not what I'm expecting. I'm really greatful for anyone who helps me solve the problem.

scatter(X,Z,1);

k= boundary (X,Z) ;

hold on;

plot (X(k), Z(k));