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Get envelope of multiples curve

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Lila wagou
Lila wagou 2016-2-27
评论： Star Strider 2023-7-28
Dear all Any idea about the envelope of 2 or more curves via Matlab; Please see the attached Xls file Thanks
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Roger Stafford
Roger Stafford 2016-2-29
编辑：Roger Stafford 2016-3-1
@Lila: The word 'envelope' is not appropriate for "fitting" a curve to a finite number of other curves. You need a precise definition of the curve you are seeking if you want matlab to determine it.

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Star Strider
Star Strider 2016-2-29
With your data, I would simply use the min and max functions:
d = xlsread('Lila wagou 3_Curves.xlsx');
t = d(:,1);
data = d(:,2:end);
env = [min(data,[],2) max(data,[],2)];
figure(1)
plot(t, data)
hold on
plot(t, env(:,1), '-g', 'LineWidth',2)
plot(t, env(:,2), '-g', 'LineWidth',2)
hold off
grid
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Anand
Anand 2023-7-27
Is there a way to characterize lets say 1k graphs, and then any new series that's added can be approved/rejected based on it being inside the envelope?

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