DLATTP
Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd..
November 2006
November 2006
Purpose
DLATTP generates a triangular test matrix in packed storage.
IMAT and UPLO uniquely specify the properties of the test
matrix, which is returned in the array AP.
IMAT and UPLO uniquely specify the properties of the test
matrix, which is returned in the array AP.
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 (N*(N+1)/2)
The upper or lower triangular matrix A, packed columnwise in
a linear array. The j-th column of A is stored in the array AP as follows: if UPLO = 'U', AP((j-1)*j/2 + i) = A(i,j) for 1<=i<=j; if UPLO = 'L', AP((j-1)*(n-j) + j*(j+1)/2 + i-j) = A(i,j) for j<=i<=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 |