rmutil: FormulaMethods – R documentation

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FormulaMethods

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

## S3 method for class 'formulafn'
covariates(z, ...)
## S3 method for class 'formulafn'
formula(x, ...)
model(z, ...)
parameters(z, ...)
## S3 method for class 'formulafn'
print(x, ...)

Arguments

`x,z`	A function of class, `formulafn`.
`...`	Arguments to other functions.

Value

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

Author(s)

J.K. Lindsey

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)

rmutil

Utilities for Nonlinear Regression and Repeated Measurements Models

v1.1.5

GPL-2

Authors

Bruce Swihart [cre, aut], Jim Lindsey [aut] (Jim created this package, Bruce is maintaining the CRAN version)

Initial release