dorgl2.f (3)  Linux Man Pages
NAME
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.
NN is INTEGER The number of columns of the matrix Q. N >= M.
KK is INTEGER The number of elementary reflectors whose product defines the matrix Q. M >= K >= 0.
AA is DOUBLE PRECISION array, dimension (LDA,N) On entry, the ith 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 mbyn matrix Q.
LDALDA is INTEGER The first dimension of the array A. LDA >= max(1,M).
TAUTAU is DOUBLE PRECISION array, dimension (K) TAU(i) must contain the scalar factor of the elementary reflector H(i), as returned by DGELQF.
WORKWORK is DOUBLE PRECISION array, dimension (M)
INFOINFO is INTEGER = 0: successful exit < 0: if INFO = i, the ith 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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