TESTING/LIN/zlattb.f(3) | Library Functions Manual | TESTING/LIN/zlattb.f(3) |
NAME
TESTING/LIN/zlattb.f
SYNOPSIS
Functions/Subroutines
subroutine zlattb (imat, uplo, trans, diag, iseed, n, kd,
ab, ldab, b, work, rwork, info)
ZLATTB
Function/Subroutine Documentation
subroutine zlattb (integer imat, character uplo, character trans, character diag, integer, dimension( 4 ) iseed, integer n, integer kd, complex*16, dimension( ldab, * ) ab, integer ldab, complex*16, dimension( * ) b, complex*16, dimension( * ) work, double precision, dimension( * ) rwork, integer info)
ZLATTB
Purpose:
ZLATTB 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 ZLATMS). 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 COMPLEX*16 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 COMPLEX*16 array, dimension (N)
WORK
WORK is COMPLEX*16 array, dimension (2*N)
RWORK
RWORK is DOUBLE PRECISION array, dimension (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.
Definition at line 139 of file zlattb.f.
Author
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