lfe (version 2.5-1998)

makeDmatrix: Make sparse matrix of dummies from factor list

Description

Given a list of factors, return the matrix of dummies as a sparse matrix.

Usage

makeDmatrix(fl, weights = NULL)

Arguments

fl

list of factors.

weights

numeric vector. Multiplied into the rows.

Value

Returns a sparse matrix.

Details

The function returns the model matrix for a list of factors. This matrix is not used internally by the package, but it's used in some of the documentation for illustrative purposes.

Examples

  fl <- lapply(1:3, function(i) factor(sample(3,10,replace=TRUE)))
  fl
  makeDmatrix(fl, weights=seq(0.1,1,0.1))