DTPTTR
November 2010 --
Purpose
DTPTTR copies a triangular matrix A from standard packed format (TP)
to standard full format (TR).
to standard full format (TR).
Arguments
| UPLO |
(input) CHARACTER*1
= 'U': A is upper triangular.
= 'L': A is lower triangular. |
| N |
(input) INTEGER
The order of the matrix A. N >= 0.
|
| AP |
(input) DOUBLE PRECISION array, dimension ( N*(N+1)/2 ),
On entry, 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(i + (j-1)*j/2) = A(i,j) for 1<=i<=j; if UPLO = 'L', AP(i + (j-1)*(2n-j)/2) = A(i,j) for j<=i<=n. |
| A |
(output) DOUBLE PRECISION array, dimension ( LDA, N )
On exit, the triangular matrix A. If UPLO = 'U', the leading
N-by-N upper triangular part of A contains the upper triangular part of the matrix A, and the strictly lower triangular part of A is not referenced. If UPLO = 'L', the leading N-by-N lower triangular part of A contains the lower triangular part of the matrix A, and the strictly upper triangular part of A is not referenced. |
| LDA |
(input) INTEGER
The leading dimension of the array A. LDA >= max(1,N).
|
| INFO |
(output) INTEGER
= 0: successful exit
< 0: if INFO = -i, the i-th argument had an illegal value |