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dorbdb6.f(3) LAPACK dorbdb6.f(3)

NAME

dorbdb6.f -

SYNOPSIS

Functions/Subroutines


subroutine dorbdb6 (M1, M2, N, X1, INCX1, X2, INCX2, Q1, LDQ1, Q2, LDQ2, WORK, LWORK, INFO)
 
DORBDB6

Function/Subroutine Documentation

subroutine dorbdb6 (integerM1, integerM2, integerN, double precision, dimension(*)X1, integerINCX1, double precision, dimension(*)X2, integerINCX2, double precision, dimension(ldq1,*)Q1, integerLDQ1, double precision, dimension(ldq2,*)Q2, integerLDQ2, double precision, dimension(*)WORK, integerLWORK, integerINFO)

DORBDB6

Purpose:

 DORBDB6 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 the zero vector is returned..fi
 
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 154 of file dorbdb6.f.

Author

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Wed Oct 15 2014 Version 3.4.2