R: Make sparse matrix of dummies from factor list

makeDmatrix {lfe} | R Documentation

## 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.

### 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.

### Value

Returns a sparse matrix.

### Examples

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

[Package lfe version 2.8-3 Index]