Can someone help me with enveloping the curve?

I need to get the result as attached. I have included the data required to plot the curve.

Answer 1

[KSSV]

Have a look on envelope.

S = importdata('data.txt') ;

data = S.data ;
t = data(:,1) ; y = data(:,2) ;

plot(t,y) ;

hold on

[up,lo] = envelope(y);

plot(t,up,'r')

Your data is in text file data.txt

[Neha Sinha]

Thank you KSSV. I need to mark the peaks on the enveloped curve. Can you help me with that?

[KSSV]

Have a look on findpeaks

[Neha Sinha]

Okay Thanks!