Curve cover (upper limit and lower limit)

Question

milad babaei 2011-10-26

0
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https://ww2.mathworks.cn/matlabcentral/answers/19547-curve-cover-upper-limit-and-lower-limit

Hi,

i plot a curve in maTLAB.i would like to know is there anyway tu make a cover for curve(sat of data plotted in a x-y axis.this is my code :(c values will call from another script...from a truncated random number generator) -------------------------------------------------------------

nsamples=3000;
       for i=1:nsamples
           CS(i)=C(1,i);
          phi(i)=((14.1477*CS(i)*CS(i))-(28.512*CS(i))+16.4557);
       end
       plot( CS,phi,'+')

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Answer 1

Walter Roberson 2011-10-26

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https://ww2.mathworks.cn/matlabcentral/answers/19547-curve-cover-upper-limit-and-lower-limit#answer_25852

You could use convhull or its newer equivalents.

If you need to follow the top or bottom edges more closely, you could do something like grid your data and find the highest and lowest occupied points per column.