DLATTR
Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd..
November 2006
November 2006
Purpose
DLATTR generates a triangular test matrix.
IMAT and UPLO uniquely specify the properties of the test
matrix, which is returned in the array A.
IMAT and UPLO uniquely specify the properties of the test
matrix, which is returned in the array A.
Arguments
| IMAT |
(input) INTEGER
An integer key describing which matrix to generate for this
path. |
| UPLO |
(input) CHARACTER*1
Specifies whether the matrix A will be upper or lower
triangular. = 'U': Upper triangular = 'L': Lower triangular |
| TRANS |
(input) CHARACTER*1
Specifies whether the matrix or its transpose will be used.
= 'N': No transpose = 'T': Transpose = 'C': Conjugate transpose (= Transpose) |
| DIAG |
(output) CHARACTER*1
Specifies whether or not the matrix A is unit triangular.
= 'N': Non-unit triangular = 'U': Unit triangular |
| ISEED |
(input/output) INTEGER array, dimension (4)
The seed vector for the random number generator (used in
DLATMS). Modified on exit. |
| N |
(input) INTEGER
The order of the matrix to be generated.
|
| A |
(output) DOUBLE PRECISION array, dimension (LDA,N)
The triangular matrix A. If UPLO = 'U', the leading n by n
upper triangular part of the array A contains the upper triangular matrix, and the strictly lower triangular part of A is not referenced. If UPLO = 'L', the leading n by n lower triangular part of the array A contains the lower triangular matrix, and the strictly upper triangular part of A is not referenced. If DIAG = 'U', the diagonal elements of A are set so that A(k,k) = k for 1 <= k <= n. |
| LDA |
(input) INTEGER
The leading dimension of the array A. LDA >= max(1,N).
|
| B |
(output) DOUBLE PRECISION array, dimension (N)
The right hand side vector, if IMAT > 10.
|
| WORK |
(workspace) DOUBLE PRECISION array, dimension (3*N)
|
| INFO |
(output) INTEGER
= 0: successful exit
< 0: if INFO = -k, the k-th argument had an illegal value |