how to calculate variance of a signal after it reaches a steady state value...
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Vidhya Dharshini
on 27 Sep 2013
Commented: Jessica
on 18 Mar 2015
The signal for which the variance is to be calculated is in the base workspace in timeseries format. i want to calculate the variance only after 0.5 seconds. How to do it?
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Image Analyst
on 29 Sep 2013
firstIndex = find(speed >= 20000, 1, 'first');
theVariance = var(speed(firstIndex : end));
Accepted Answer
Image Analyst
on 27 Sep 2013
Edited: Image Analyst
on 27 Sep 2013
What element does 0.5 seconds occur at? Let's say it's element 42, so then you do
varSteadyState = var(yourSignal(42:end));
Let's say you have a vector t with the times, and a vector yourSignal with the signal value. You can find the index for which t equals or passes 0.5 seconds like this:
startingElement = find(t>=0.5, 1, 'first');
varSteadyState = var(yourSignal(startingElement :end));
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