TESTING/LIN/dlattb.f(3)

NAME
TESTING/LIN/dlattb.f

SYNOPSIS

  Functions/Subroutines
subroutine dlattb (imat, uplo, trans, diag, iseed, n, kd, ab, ldab, b, work, info)
DLATTB

Function/Subroutine Documentation

  subroutine dlattb (integer imat, character uplo, character trans, character diag, integer, dimension( 4 ) iseed, integer n, integer kd, double precision, dimension( ldab, * ) ab, integer ldab, double precision, dimension( * ) b, double precision, dimension( * ) work, integer info)

DLATTB

Purpose:

    !>
    !> DLATTB generates a triangular test matrix in 2-dimensional storage.
    !> IMAT and UPLO uniquely specify the properties of the test matrix,
    !> which is returned in the array A.
    !>

Parameters
    IMAT

    !>          IMAT is INTEGER
    !>          An integer key describing which matrix to generate for this
    !>          path.
    !>

    UPLO

    !>          UPLO is CHARACTER*1
    !>          Specifies whether the matrix A will be upper or lower
    !>          triangular.
    !>          = 'U':  Upper triangular
    !>          = 'L':  Lower triangular
    !>

    TRANS

    !>          TRANS is CHARACTER*1
    !>          Specifies whether the matrix or its transpose will be used.
    !>          = 'N':  No transpose
    !>          = 'T':  Transpose
    !>          = 'C':  Conjugate transpose (= transpose)
    !>

    DIAG

    !>          DIAG is CHARACTER*1
    !>          Specifies whether or not the matrix A is unit triangular.
    !>          = 'N':  Non-unit triangular
    !>          = 'U':  Unit triangular
    !>

    ISEED

    !>          ISEED is INTEGER array, dimension (4)
    !>          The seed vector for the random number generator (used in
    !>          DLATMS).  Modified on exit.
    !>

    N

    !>          N is INTEGER
    !>          The order of the matrix to be generated.
    !>

    KD

    !>          KD is INTEGER
    !>          The number of superdiagonals or subdiagonals of the banded
    !>          triangular matrix A.  KD >= 0.
    !>

    AB

    !>          AB is DOUBLE PRECISION array, dimension (LDAB,N)
    !>          The upper or lower triangular banded matrix A, stored in the
    !>          first KD+1 rows of AB.  Let j be a column of A, 1<=j<=n.
    !>          If UPLO = 'U', AB(kd+1+i-j,j) = A(i,j) for max(1,j-kd)<=i<=j.
    !>          If UPLO = 'L', AB(1+i-j,j)    = A(i,j) for j<=i<=min(n,j+kd).
    !>

    LDAB

    !>          LDAB is INTEGER
    !>          The leading dimension of the array AB.  LDAB >= KD+1.
    !>

    B

    !>          B is DOUBLE PRECISION array, dimension (N)
    !>

    WORK

    !>          WORK is DOUBLE PRECISION array, dimension (2*N)
    !>

    INFO

    !>          INFO is INTEGER
    !>          = 0:  successful exit
    !>          < 0: if INFO = -k, the k-th argument had an illegal value
    !>

Author
    Univ. of Tennessee

    Univ. of California Berkeley

    Univ. of Colorado Denver

    NAG Ltd.

Definition at line 133 of file dlattb.f.

Author

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