How to create an envelope in a plot from a csv. data?

Hey guys,

I'm struggeling right now to create an envelope to a plot from my csv. data. Could somebody pls help me?

I've got the following code already:

fileName  = 'test_amplitude_100_4.csv';
t         = readtable(fileName);
times     = t.Var1;
distances = t.Var2-6.894;
times     = seconds(times-times(3));

figure(1)
plot(times, distances, 'b-');
grid on;
hold on;

xlabel('Zeit in s');
ylabel('Entfernung in mm');

Answer 1

[Sam Chak]

Hi @Mathias Braun

MATLAB has a function called envelope() that enables users to compute the upper and lower envelopes of a signal. You can find more information about it here:

https://www.mathworks.com/help/signal/ref/envelope.html

Have you had a chance to check this out?

[Mathias Braun]

Hi @Sam Chak

Yes, I check it out but I dont get what shut be my q in the envelope? Is this the distances variable?