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to find the envelope of some data in Matlab

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orcad

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matlab envelope

I have some discreet data
but is there any function to find the envelope of the data in matlab?
thx!
 

jacobus

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envelope matlab

you may do it like the following:

plot(t,y)
hold on
ind=find(diff(sign(diff(y)))==+2)+1;
val=interp1(t(ind),y(ind),t,'linear');
plot(t,val,'r')
 

    orcad

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