dlattb.f - Man Page
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
Generated automatically by Doxygen for LAPACK from the source code.
Referenced By
The man page dlattb(3) is an alias of dlattb.f(3).
Tue Nov 28 2023 12:08:43 Version 3.12.0 LAPACK