R: Object Finder

fmobj {rmutil} | R Documentation

## Object Finder

### Description

`fmobj` inspects a formula and returns a list containing the objects referred to, with indicators as to which are unknown parameters, covariates, factor variables, and functions.

### Usage

    fmobj(z, envir=parent.frame())

### Arguments

`z` | A model formula beginning with ~, either in Wilkinson and Rogers notation or containing unknown parameters.
`envir` | The environment in which the formula is to be interpreted.

### Value

A list, of class `fmobj`, containing a character vector (`objects`) with the names of the objects used in a formula, and logical vectors indicating which are unknown parameters (`parameters`), covariates (`covariates`), factor variables (`factors`), and functions (`functions`).

### Author(s)

J.K. Lindsey

### See Also

`finterp`

### Examples

    x1 <- rpois(20,2)
    x2 <- rnorm(20)
    x3 <- gl(2,10)
    #
    # W&R formula
    fmobj(~x1+x2+x3)
    #
    # formula with unknowns
    fmobj(~b0+b1*x1+b2*x2)
    #
    # nonlinear formulae with unknowns
    # log link
    fmobj(~exp(b0+b1*x1+b2*x2))

[Package rmutil version 1.1.3 Index]