Momocs (version 1.4.1)

fac_dispatcher: Brew and serve fac from Momocs object

Description

Ease various specifications for fac specification when passed to Momocs objects. Intensively used (internally).

Usage

fac_dispatcher(x, fac)

Value

a prepared factor (or a numeric). See examples

Arguments

x

a Momocs object (any Coo, Coe, PCA, etc.)

fac

a specification to extract from fac

Details

fac can be:

• a factor, passed on the fly

• a column id from $fac

• a column name from fac; if not found, return NULL with a message

• a formula in the form: ~column_name (from $fac, no quotes). It expresses more in a concise way. Also allows interacting on the fly. See examples.

• a NULL returns a NULL, with a message

See Also

Other handling functions: arrange(), at_least(), chop(), combine(), dissolve(), filter(), mutate(), rename(), rescale(), rm_harm(), rm_missing(), rm_uncomplete(), rw_fac(), sample_frac(), sample_n(), select(), slice(), subsetize()

Examples

bot <- mutate(bot, s=rnorm(40), fake=factor(rep(letters[1:4], 10)))

# factor, on the fly
fac_dispatcher(bot, factor(rep(letters[1:4], 10)))

# column id
fac_dispatcher(bot, 1)

# column name
fac_dispatcher(bot, "type")
# same, numeric case
fac_dispatcher(bot, "s")

# formula interface
fac_dispatcher(bot, ~type)

# formula interface + interaction on the fly
fac_dispatcher(bot, ~type+fake)

# when passing NULL or non existing column
fac_dispatcher(42, NULL)
fac_dispatcher(bot, "loser")