doBy (version 4.6.22)

formula_ops: Formula operations and coercion.

Description

Formula operations and coercion as a supplement to update.formula()

Usage

formula_add_str(frm1, terms, op = "+")
formula_add(frm1, frm2)
formula_poly(chr1, n, noint = FALSE, y = NULL)
formula_nth(frm1, n)
formula_to_interaction_matrix(frm1)
formula_chr_to_form(rhs, lhs = character(0))
to_str(chr1, collapse = "+")
terms_labels(frm1)
simplify_rhs(object)
# S3 method for formula
simplify_rhs(object)
# S3 method for character
simplify_rhs(object)
as_rhs_frm(object)
as_lhs_frm(object)
as_rhs_chr(object, string = FALSE)
as_lhs_chr(object, string = FALSE)
unique_formula(list_of_formulas)

Arguments

frm1, frm2

Formulas to be coerced to character vectors.

terms

Character string.

op

Either "+" (default) or "-".

chr1

Character vector to be coerced to formulas.

n

Positive integer.

noint

Boolean.

y

Response

rhs, lhs

right-hand-side and left-hand-side for formula (as characters)

collapse

Character to use as separator.

object

Character vector or formula.

string

Boolean.

list_of_formulas

list of formulas

Examples

formula_poly("z", 2)
formula_poly("z", 2, noint=TRUE)

as_rhs_chr(c("a", "b", "z"))
as_rhs_chr(c("a*b", "z"))

as_rhs_chr(y~a+b+z)
as_rhs_chr(y~a+b+z, string=TRUE)
as_rhs_chr(y~a+b+z)
as_rhs_chr(y~a*b+z)
as_rhs_chr(y~a*b+z, string=TRUE)

as_lhs_chr(y~a*b+z)
as_lhs_chr(log(y)~a*b+z)      ## Not what one might expect
as_lhs_chr(cbind(y, u)~a*b+z) ## Not what one might expect

formula_chr_to_form(c("a*b", "z"))
formula_chr_to_form(c("a*b", "z"), "y")
formula_chr_to_form(c("a*b", "z"), "log(y)")

formula_add(y~a*b+z, ~-1)
formula_add(y~a*b+z, ~a:b)

formula_add_str(y~x1 + x2, "x3")
formula_add_str(y~x1 + x2, "x1")
formula_add_str(y~x1 + x2, "x1", op="-")