DER Estimates the derivative of an array X with respect to its argument T: dX/dT by evaluating the slope of a polynomial fit of elements "close" to each point. This "closeness" is controlled by an optional input called window width, in turn this controls the smoothness.
>> dXdT = der(X,DT);
where X is a time series and DT its sampling interval.
>> dXdT = der(X,T);
if T is not uniform.
Other optional inputs are:
- the window width (W)
- the polynomial fit degree (DEG)
- the padding (PAD) % to improve derivatives at edges
Besides, the error of the dXdT estimate may be obtained.
Bugs reports and comments will be very appreciated!
Carlos Adrian Vargas Aguilera (2023). der.m v1.0 (Nov, 2009) (https://www.mathworks.com/matlabcentral/fileexchange/25818-der-m-v1-0-nov-2009), MATLAB Central File Exchange. Retrieved .
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