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formFuns

test formula: does it contain a particular element?

Description

test formula: does it contain a particular element?

extract terms with a given head from an expression/formula

return a formula/expression with a given value stripped, where it occurs as the head of a term

drop terms matching a particular value from an expression

Usage

inForm(form, value)

extractForm(term, value)

dropHead(term, value)

drop.special2(x, value = quote(offset), preserve = NULL)

Arguments

value

term to remove from formula
term

expression/formula
x

formula
preserve

(integer) retain the specified occurrence of "value"

Value

a list of expressions

Examples

inForm(z~.,quote(.))
inForm(z~y,quote(.))
inForm(z~a+b+c,quote(c))
inForm(z~a+b+(d+e),quote(c))
f <- ~ a + offset(x)
f2 <- z ~ a
inForm(f,quote(offset))
inForm(f2,quote(offset))
extractForm(~a+offset(b),quote(offset))
extractForm(~c,quote(offset))
extractForm(~a+offset(b)+offset(c),quote(offset))
dropHead(~a+offset(b),quote(offset))
dropHead(~a+poly(x+z,3)+offset(b),quote(offset))
glmmTMB

Generalized Linear Mixed Models using Template Model Builder

v1.0.2.1
AGPL-3
Authors
Arni Magnusson [aut] (<https://orcid.org/0000-0003-2769-6741>), Hans Skaug [aut], Anders Nielsen [aut] (<https://orcid.org/0000-0001-9683-9262>), Casper Berg [aut] (<https://orcid.org/0000-0002-3812-5269>), Kasper Kristensen [aut], Martin Maechler [aut] (<https://orcid.org/0000-0002-8685-9910>), Koen van Bentham [aut], Ben Bolker [aut] (<https://orcid.org/0000-0002-2127-0443>), Nafis Sadat [ctb] (<https://orcid.org/0000-0001-5715-616X>), Daniel Lüdecke [ctb] (<https://orcid.org/0000-0002-8895-3206>), Russ Lenth [ctb], Joseph O'Brien [ctb] (<https://orcid.org/0000-0001-9851-5077>), Mollie Brooks [aut, cre] (<https://orcid.org/0000-0001-6963-8326>)
Initial release

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