dorgl2.f (3) Linux Manual Page

dorgl2.f –

Synopsis

Functions/Subroutines

subroutine dorgl2 (M, N, K, A, LDA, TAU, WORK, INFO)
DORGL2

Function/Subroutine Documentation

subroutine dorgl2 (integerM, integerN, integerK, double precision, dimension( lda, * )A, integerLDA, double precision, dimension( * )TAU, double precision, dimension( * )WORK, integerINFO)

DORGL2

Purpose:

 DORGL2 generates an m by n real matrix Q with orthonormal rows,

 which is defined as the first m rows of a product of k elementary

 reflectors of order n

 Q = H(k) . . . H(2) H(1)

 as returned by DGELQF.

 

Parameters:

M

 M is INTEGER

 The number of rows of the matrix Q. M >= 0.

N

 N is INTEGER

 The number of columns of the matrix Q. N >= M.

K

 K is INTEGER

 The number of elementary reflectors whose product defines the

 matrix Q. M >= K >= 0.

A

 A is DOUBLE PRECISION array, dimension (LDA,N)

 On entry, the i-th row must contain the vector which defines

 the elementary reflector H(i), for i = 1,2,…,k, as returned

 by DGELQF in the first k rows of its array argument A.

 On exit, the m-by-n matrix Q.

LDA

 LDA is INTEGER

 The first dimension of the array A. LDA >= max(1,M).

TAU

 TAU is DOUBLE PRECISION array, dimension (K)

 TAU(i) must contain the scalar factor of the elementary

 reflector H(i), as returned by DGELQF.

WORK

 WORK is DOUBLE PRECISION array, dimension (M)

INFO

 INFO is INTEGER

 = 0: successful exit

 < 0: if INFO = -i, the i-th argument has an illegal value

 

Author:

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Date:

November 2011

Definition at line 114 of file dorgl2.f.

Author

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