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zunbdb6.f(3) LAPACK zunbdb6.f(3)

NAME

zunbdb6.f -

SYNOPSIS

Functions/Subroutines


subroutine zunbdb6 (M1, M2, N, X1, INCX1, X2, INCX2, Q1, LDQ1, Q2, LDQ2, WORK, LWORK, INFO)
 
ZUNBDB6

Function/Subroutine Documentation

subroutine zunbdb6 (integerM1, integerM2, integerN, complex*16, dimension(*)X1, integerINCX1, complex*16, dimension(*)X2, integerINCX2, complex*16, dimension(ldq1,*)Q1, integerLDQ1, complex*16, dimension(ldq2,*)Q2, integerLDQ2, complex*16, dimension(*)WORK, integerLWORK, integerINFO)

ZUNBDB6

Purpose: 

 ZUNBDB6 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 COMPLEX*16 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 COMPLEX*16 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 COMPLEX*16 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 COMPLEX*16 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 COMPLEX*16 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 zunbdb6.f.

Author

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