dorbdb6 (3) Linux Manual Page

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 .SH "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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