If I plot a group of points like the one below, how do I differentiate and extract say the points on the bottom boundary? What about 3 dimensions?
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Interesting question! Would you please provide the code for the shown example? – Henrik Schumacher Mar 13 '18 at 08:14
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2I guess it should be easy to adapt upper envelope of data – Kuba Mar 13 '18 at 08:22
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@HenrikSchumacher My code is most complicated and generate a large number of points, I don't know how to encapsulate them:< – 2ub Mar 13 '18 at 08:24
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@Kuba The example you provided seems to not extract the boundary points but only to fit a proper function as boundary? – 2ub Mar 13 '18 at 08:26
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@updraft not really, while answers aim in providing a smooth result, most of them has an intermediate step of extracting the envelope. btw, search around 'envelope points' and similar keywords, there are few related topics. – Kuba Mar 13 '18 at 08:29
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@Kuba yes I see your point, thank you for the info! – 2ub Mar 13 '18 at 08:31