qr {float}

QR

Description

QR factorization and related functions.

Usage

## S4 method for signature 'float32'
qr(x, tol = 1e-07, ...)

## S4 method for signature 'ANY'
qr.Q(qr, complete = FALSE, Dvec)

## S4 method for signature 'ANY'
qr.R(qr, complete = FALSE)

## S4 method for signature 'ANY'
qr.qy(qr, y)

## S4 method for signature 'ANY'
qr.qty(qr, y)

Arguments

x

A float matrix.

tol

The tolerance for determining numerical column rank.

...

Ignored.

qr

Output of qr().

complete

Should the complete or truncated factor be returned?

Dvec

Vector of diagonals to use when re-constructing Q (default is 1's).

y

A vector/matrix or right hand sides (int, float, or double).

Details

The factorization is performed by the LAPACK routine sgeqp3(). This should be similar to calling qr() on an ordinary R matrix with the argument LAPACK=TRUE. Calling qr(x, LAPACK=FALSE) on a double precision matrix 'x' (the default) will not be comparable in performance (it is much slower) or numerics to calling qr(s) where 's' is single a float matrix.

Examples

library(float)

x = flrunif(10, 3)
qr(x)