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Home MathPack Math2 Procedures and Functions FirstDeriv  
See also: PolynomialSmooth, SecondDeriv  
FirstDeriv 

The procedure FirstDeriv calculates the smoothed first derivative of a series of data by fitting a second order polynomial to the (unsmoothed) first derivative. The number of data points used for estimating the smoothed derivative can be adjusted by setting the parameter WindowSize. It may take values between 5 and 25 and has to be an odd number; any invalid number triggers an ESDLMath2Error exception (see below). The source data series is contained in the vector SourceVec. You may restrict the range of data to be submitted to the derivation algorithm by setting the parameters FirstElem, and LastElem properly. The resulting data series is stored in the vector DestVec (starting at position 1). Please note that the first, and the last (WindowSize div 2) elements cannot be processed and are replaced by the nearest available smoothed value.
FirstDeriv may create the following exceptions of type ESDLMath2Error:
'FirstDeriv: either SourceVec or DestVec is undefined' Note: The algorithm of FirstDeriv has been implemented according to the following paper: A. Savitzky, M.J.E. Golay: Anal.Chem. 36 (1964) 1627
