nderive {acopula}

Numerical derivative

Description

Linear approximation to function partial derivatives of arbitrary order and dimension.

Usage

nderive(fun, point = c(0), order = c(1), difference = 1e-04, area = c(0, 1, -1))

Arguments

fun

function. Arguments can be in sequence or single vector.

point

numeric vector. Where to evaluate the derivative.

order

numeric vector of orders for each variable.

difference

numeric. A change in the variable that (by limit) is to approach zero.

area

numeric. One of {0,1,-1} representing two-sided, right-sided or left-sided limit, respectively.

Value

Numeric.

Author(s)

Tomas Bacigal

See Also

nintegrate

Examples

##density of a bivariate Gumbel copula evaluated in point c(0.5,0.6)
nderive(fun = function(x) pCopula(x,genGumbel(),gpar=3.5), point = c(0.5,0.6),
        order = c(1,1))