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[SOLVED] matlab help+envelope of a signal

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sayfee

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say i have signal
a=[1 1 2 3 1 2 3];

i want to plot the envelope of this signal, how to do that in matlab?
thank you in advance.
 

These are few points to graph a good envelope.

For a general case use the Hilbert transform.

ht = hilbert(a) ; plot(abs(ht))
 
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    sayfee

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_Eduardo_ said:
These are few points to graph a good envelope.

For a general case use the Hilbert transform.

ht = hilbert(a) ; plot(abs(ht))
Click to expand...
the envelope isnt following the massage..can u suggest me another code which follows accurately ??
thank you for your reply
eboard.jpg
 

But what is the definition of envelope you use?.
When you have a few points is not as intuitive as it is in a typical AM signal

The general definition is the modulus of the analytic signal, which is the value returned by the function hilbert ()
 

ok i need something like this:eboard2.JPG
i draw the picture so the lines are not strait.
 

the problem is sloved,
all i have to do is

plot(a),hold on
stem(a)
eboardd.jpg
thank you sir for your cooperation
 

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