latticeParseFormula {lattice}R Documentation

Parse Trellis formula

Description

this function is used in trellis functions. Might be useful by itself. y and g_1,...,\g_n may be missing.

Usage

latticeParseFormula(model, data, dimension = 2)

Arguments

model the model/formula to be parsed. This can be in either of two possible forms, one for 2d and one for 3d formulas, determined by the dimension argument. The 2d formulas are of the form y~x|g_1*...*g_n, and the 3d formulas are of the form z~x*y|g_1*...*g_n. In the first form, y may be omitted. The conditioning variables g_1, ...,g_n can be omitted in either case.
data the environment/dataset where the variables in the formula are evaluated. By default, the environment where the function was called from.
dimension dimension of the model, see above

Value

returns a list with components left, right, left.name, right.name, condition for 2d, and left, right.x, right.y, left.name, right.x.name, right.y.name, condition for 3d.

Author(s)

Saikat DebRoy saikat@stat.wisc.edu

See Also

xyplot, Lattice


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