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Methods for calculating (usually) accurate numerical first and second order derivatives. Accurate calculations are done using 'Richardson''s' extrapolation or, when applicable, a complex step derivative is available. A simple difference method is also provided. Simple difference is (usually) less accurate but is much quicker than 'Richardson''s' extrapolation and provides a useful crosscheck. Methods are provided for real scalar and vector valued functions.
Package details 


Author  Paul Gilbert and Ravi Varadhan 
Maintainer  Paul Gilbert <pgilbert.ttv9z@ncf.ca> 
License  GPL2 
Version  2016.81.1 
URL  http://optimizer.rforge.rproject.org/ 
Package repository  View on CRAN 
Installation 
Install the latest version of this package by entering the following in R:

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