comb: Generate all desired exponent vectors of a given degree.

In SSM: Fit and Analyze Smooth Supersaturated Models

Description

comb recursively generates all the desired exponent vectors of a given degree and is called by degl to generate the matrix put into the basis slot of the SSM object.

Usage

comb(d, deg, N = choose(d + deg - 1, deg), vec, start = TRUE, parent,
  exclude = list())

Arguments

d	A number. Controls the number of recursions before stopping.
deg	A number. The desired degree of resulting exponent vectors.
N	(optional) A number. Sets the number of exponent vectors that will be generated. If not supplied, all candidate vectors will be generated.
vec	A vector. Stores the current state of the generated vector during recursion.
start	(optional) Logical. A flag used to identify the initial call environment.
parent	(optional) An environment. Stores the environment name of the initializing function call.
exclude	(optional) A list of integer vectors which is used to exclude the generation of undesired exponent vectors. e.g. If 1 is a vector in the list then any generated vector which is non-zero in the first column and zero everywhere else will be thrown away.

Details

This function is called by degl during the process of constructing the objects related to the basis of a smooth supersaturated model. It constructs the first N exponent vectors of degree d, excluding those which are non-zero only in the columns specified by vectors listed in exclude. It operates recursively.

Value

A matrix of exponent vectors

SSM documentation built on May 1, 2019, 10:09 p.m.