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nanderivative.m v2.1 (Jul 2009)

22 Aug 2008 (Updated 29 Jul 2009)

Code covered by the BSD License

N-order derivative of vector data by interpolating nearby points, ignoring NaNs.

File Information
Description	This program estimates the N-order (1rst derivative by default) derivative of a vector data Y (or the columns of a matrix) by interpolating, using INTERP1, two nearby points at each argument point X and then calculating their slope. It ignores NaNs elements. >> dYdX = nanderivative(Y,X); The N-order, the proximity of the interpolating points and the interpolation method (default 'spline') are optional input arguments. Any comment will be very appreciated. (check the screenshot for an example)
Acknowledgements	This submission has inspired the following: der.m v1.0 (Nov, 2009)
MATLAB release	MATLAB 7.7 (R2008b)
Zip File Content
Other Files	license.txt, nanderivative.m

Tags for This File
Everyone's Tags	approximation, cubic, derivative(2), diff, gradient, interp1, interpolation, linear, nan, slope, spline
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Updates
08 Jun 2009	Rewritten code. Mayor changes with inputs and link axes. Fixed bugs with floating point error, monotonically increasing/decreasing X and if N is not 1 do not outputs all other derivatives anymore.
29 Jul 2009	v2.1 Fixed small bug with INTERP1.

Tag Activity for this File
Tag	Applied By	Date/Time
approximation	Carlos Adrian Vargas Aguilera	22 Oct 2008 10:15:38
interpolation	Carlos Adrian Vargas Aguilera	22 Oct 2008 10:15:38
diff	Carlos Adrian Vargas Aguilera	22 Oct 2008 10:15:38
gradient	Carlos Adrian Vargas Aguilera	22 Oct 2008 10:15:38
derivative	Carlos Adrian Vargas Aguilera	22 Oct 2008 10:15:38
nan	Carlos Adrian Vargas Aguilera	22 Oct 2008 10:15:38
slope	Carlos Adrian Vargas Aguilera	22 Oct 2008 10:15:38
spline	Carlos Adrian Vargas Aguilera	22 Oct 2008 10:15:38
cubic	Carlos Adrian Vargas Aguilera	22 Oct 2008 10:15:38
linear	Carlos Adrian Vargas Aguilera	22 Oct 2008 10:15:38
interp1	Carlos Adrian Vargas Aguilera	22 Oct 2008 10:15:38
derivative	John Deas	21 Jan 2009 08:16:00

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