cunbdb6.f(3)

NAME
cunbdb6.f

SYNOPSIS

  Functions/Subroutines
subroutine cunbdb6 (M1, M2, N, X1, INCX1, X2, INCX2, Q1, LDQ1, Q2, LDQ2, WORK, LWORK, INFO)
CUNBDB6

Function/Subroutine Documentation

  subroutine cunbdb6 (integer M1, integer M2, integer N, complex, dimension(*) X1, integer INCX1, complex, dimension(*) X2, integer INCX2, complex, dimension(ldq1,*) Q1, integer LDQ1, complex, dimension(ldq2,*) Q2, integer LDQ2, complex, dimension(*) WORK, integer LWORK, integer INFO)

CUNBDB6

Purpose:

     CUNBDB6 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.

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 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 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 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 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 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 156 of file cunbdb6.f.

Author

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