TESTING/LIN/slattb.f(3)

NAME
TESTING/LIN/slattb.f

SYNOPSIS

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

Function/Subroutine Documentation

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

SLATTB

Purpose:

     SLATTB 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
              SLATMS).  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 REAL 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 REAL array, dimension (N)

    WORK

              WORK is REAL 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 slattb.f.

Author

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