Argument of a signal

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Athira Surendran
Athira Surendran 2017-2-7
I've energy-time signal data e(t)having discrete values(file attached). I want to do the following operation:
  • t[5%]=arg(e(t)) at 5% peak value.
  • Plot(t,e(t-t[5%])).
How to write code for this?
  1 个评论
Walter Roberson
Walter Roberson 2017-2-7
When you write arg(e(t)) at 5% peak value, do you mean that you want to know the index of the point at which the energy reaches 5% of its peak?

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回答(1 个)

Walter Roberson
Walter Roberson 2017-2-7
data = xlsread('data.xls');
e = data(:,2);
t = data(:,3);
maxe = max(e);
e5 = maxe * 0.05;
[~, idx5] = min( abs(e - e5) );
t5 = t(idx5);
plot(t(1:end-idx5+1), e(idx5:end))
... I guess. Your notation for what you want to plot is not clear.

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