Matrix (version 0.9-1)

mm: A sample sparse model matrix

Description

A model matrix used in an example by Koenker and Ng. This is a sparse matrix with 1850 rows and 712 columns but only 8758 non-zero entries. It is a "cscMatrix" object.

Usage

data(mm)

References

Roger Koenker and Pin Ng (2003), ``SparseM: A sparse matrix package for R'', J. of Statistical Software, 8(6).

Examples

data(mm)
data(y)
class(mm)
dim(mm)
str(mm)
str(y)
sparse.sol = solve(crossprod(mm), crossprod(mm, y))
str(sparse.sol)