Test of accuracy of as.character() for a numeric input using the
standard arithmetic.
The function check.as.character() creates pairs of close
numbers, which should have a different character representation
and checks, whether they are converted to different values by
as.character().

The function check.as.character() creates pairs of close
numbers, which should have a different character
representation, and checks, whether they are converted to
different values by as.character().

Functions scientific.mpfr() and get.format.from.sci()
allow to compute format information for numbers with high
accuracy using Rmpfr package. Function check.format() compares
this to the output of R base function format.info(). On
platforms with a proper "long double" type, the error should
not exceed 1 ulp of the input number.

Accurate Numerical Derivatives. See ?numDeriv.Intro for more details.
Paul Gilbert and Ravi Varadhan <pgilbert@bank-banque-canada.ca>

Accurate Numerical Derivatives. See ?numDeriv.Intro for
more details.
Paul Gilbert and Ravi Varadhan
<pgilbert@bank-banque-canada.ca>

This package provide methods for calculating (usually)
accurate numerical first and second order derivatives. Accurate
calculations are done using Richardson's extrapolation, but a
simple difference method is also provided. Simple difference is
(usually) less accurate but is much quicker and provides a
useful cross-check. Methods are provided for real scalar and
vector valued functions.
Paul Gilbert and Ravi Varadhan <pgilbert.ttv9z@ncf.ca>

This package provide 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 cross-check.  Methods are
provided for real scalar and vector valued functions.
2006-2011, Bank of Canada. 2012, Paul Gilbert