dorbdb5.f - Online Linux Manual PageSection : 3
Updated : Tue Nov 14 2017
Source : Version 3.8.0
Note : LAPACK

NAMEdorbdb5.f

SYNOPSIS

Functions/Subroutinessubroutine dorbdb5 (M1, M2, N, X1, INCX1, X2, INCX2, Q1, LDQ1, Q2, LDQ2, WORK, LWORK, INFO)
DORBDB5

Function/Subroutine Documentation

subroutine dorbdb5 (integer M1, integer M2, integer N, double precision, dimension(*) X1, integer INCX1, double precision, dimension(*) X2, integer INCX2, double precision, dimension(ldq1,*) Q1, integer LDQ1, double precision, dimension(ldq2,*) Q2, integer LDQ2, double precision, dimension(*) WORK, integer LWORK, integer INFO)DORBDB5 Purpose: DORBDB5 orthogonalizes the column vector X = [ X1 ] [ X2 ] with respect to the columns of Q = [ Q1 ] . [ Q2 ] The columns of Q must be orthonormal. If the projection is zero according to Kahan's "twice is enough" criterion, then some other vector from the orthogonal complement is returned. This vector is chosen in an arbitrary but deterministic way.Parameters: M1 M1 is INTEGER The dimension of X1 and the number of rows in Q1. 0 <= M1.
M2
M2 is INTEGER The dimension of X2 and the number of rows in Q2. 0 <= M2.
N
N is INTEGER The number of columns in Q1 and Q2. 0 <= N.
X1
X1 is DOUBLE PRECISION array, dimension (M1) On entry, the top part of the vector to be orthogonalized. On exit, the top part of the projected vector.
INCX1
INCX1 is INTEGER Increment for entries of X1.
X2
X2 is DOUBLE PRECISION array, dimension (M2) On entry, the bottom part of the vector to be orthogonalized. On exit, the bottom part of the projected vector.
INCX2
INCX2 is INTEGER Increment for entries of X2.
Q1
Q1 is DOUBLE PRECISION array, dimension (LDQ1, N) The top part of the orthonormal basis matrix.
LDQ1
LDQ1 is INTEGER The leading dimension of Q1. LDQ1 >= M1.
Q2
Q2 is DOUBLE PRECISION array, dimension (LDQ2, N) The bottom part of the orthonormal basis matrix.
LDQ2
LDQ2 is INTEGER The leading dimension of Q2. LDQ2 >= M2.
WORK
WORK is DOUBLE PRECISION array, dimension (LWORK)
LWORK
LWORK is INTEGER The dimension of the array WORK. LWORK >= N.
INFO
INFO is INTEGER = 0: successful exit. < 0: if INFO = -i, the i-th argument had an illegal value.Author: Univ​. of Tennessee Univ​. of California Berkeley Univ​. of Colorado Denver NAG Ltd​. Date: July 2012 Definition at line 158 of file dorbdb5​.f​.

AuthorGenerated automatically by Doxygen for LAPACK from the source code​.
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