dtrttp (3) - Linux Man Pages
subroutine dtrttp (characterUPLO, integerN, double precision, dimension( lda, * )A, integerLDA, double precision, dimension( * )AP, integerINFO)
DTRTTP copies a triangular matrix from the standard full format (TR) to the standard packed format (TP).
DTRTTP copies a triangular matrix A from full format (TR) to standard packed format (TP).
UPLO is CHARACTER*1 = 'U': A is upper triangular. = 'L': A is lower triangular.
N is INTEGER The order of the matrices AP and A. N >= 0.
A is 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 is INTEGER The leading dimension of the array A. LDA >= max(1,N).
AP is DOUBLE PRECISION array, dimension (N*(N+1)/2 On exit, 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.
INFO is INTEGER = 0: successful exit < 0: if INFO = -i, the i-th argument had an illegal value
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
- September 2012
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