![]() |
LAPACK
3.7.0
LAPACK: Linear Algebra PACKage
|
| subroutine clattb | ( | integer | IMAT, |
| character | UPLO, | ||
| character | TRANS, | ||
| character | DIAG, | ||
| integer, dimension( 4 ) | ISEED, | ||
| integer | N, | ||
| integer | KD, | ||
| complex, dimension( ldab, * ) | AB, | ||
| integer | LDAB, | ||
| complex, dimension( * ) | B, | ||
| complex, dimension( * ) | WORK, | ||
| real, dimension( * ) | RWORK, | ||
| integer | INFO | ||
| ) |
CLATTB
CLATTB 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.
| [in] | IMAT | IMAT is INTEGER
An integer key describing which matrix to generate for this
path. |
| [in] | UPLO | UPLO is CHARACTER*1
Specifies whether the matrix A will be upper or lower
triangular.
= 'U': Upper triangular
= 'L': Lower triangular |
| [in] | TRANS | TRANS is CHARACTER*1
Specifies whether the matrix or its transpose will be used.
= 'N': No transpose
= 'T': Transpose
= 'C': Conjugate transpose (= transpose) |
| [out] | DIAG | DIAG is CHARACTER*1
Specifies whether or not the matrix A is unit triangular.
= 'N': Non-unit triangular
= 'U': Unit triangular |
| [in,out] | ISEED | ISEED is INTEGER array, dimension (4)
The seed vector for the random number generator (used in
CLATMS). Modified on exit. |
| [in] | N | N is INTEGER
The order of the matrix to be generated. |
| [in] | KD | KD is INTEGER
The number of superdiagonals or subdiagonals of the banded
triangular matrix A. KD >= 0. |
| [out] | AB | AB is COMPLEX 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). |
| [in] | LDAB | LDAB is INTEGER
The leading dimension of the array AB. LDAB >= KD+1. |
| [out] | B | B is COMPLEX array, dimension (N) |
| [out] | WORK | WORK is COMPLEX array, dimension (2*N) |
| [out] | RWORK | RWORK is REAL array, dimension (N) |
| [out] | INFO | INFO is INTEGER
= 0: successful exit
< 0: if INFO = -i, the i-th argument had an illegal value |