FormulaMethods {rmutil}R Documentation

Methods for formulafn Functions

Description

Methods for accessing the contents of a function created from formula produced by finterp or a function modified by fnenvir.

covariates: extract the names of the covariates.

formula: extract the formula used to produce the function (finterp only).

model: extract the model function or model matrix if W&R notation was used.

parameters: extract the names of the parameters.

Usage

covariates(z)
formula(z)
model(z)
parameters(z)
print(z)

Arguments

z A function of class, formulafn.

Value

These methods extract information about functions of class, formulafn, created by finterp or fnenvir.

Author(s)

J.K. Lindsey

See Also

finterp, fnenvir.

Examples

x1 <- rpois(20,2)
x2 <- rnorm(20)
#
# Wilkinson and Rogers formula with three parameters
fn1 <- finterp(~x1+x2)
fn1
covariates(fn1)
formula(fn1)
model(fn1)
parameters(fn1)
#
# nonlinear formula with unknowns
fn2 <- finterp(~exp(b0+b1*x1+b2*x2))
fn2
covariates(fn2)
formula(fn2)
model(fn2)
parameters(fn2)
#
# function transformed by fnenvir
fn3 <- fnenvir(function(p) p[1]+p[2]*x1)
covariates(fn3)
formula(fn3)
model(fn3)
parameters(fn3)

[Package rmutil version 1.0 Index]