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template<typename T>
void trttp(char *uplo, integer *n, T *a, integer *lda, T *ap, integer *info)# TRTTP copies a triangular matrix from the standard full
format (TR) to the standard packed format (TP).
Purpose:
TRTTP copies a triangular matrix A from full format (TR) to standard packed format (TP).
- Parameters:
UPLO – [in]
UPLO is CHARACTER*1
= ‘U’: A is upper triangular.
= ‘L’: A is lower triangular.N – [in]
N is INTEGER
The order of the matrices AP and A. N >= 0.
A – [in]
A is REAL 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 – [in]
LDA is INTEGER
The leading dimension of the array A. LDA >= fla_max(1,N).
AP – [out]
AP is REAL 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 – [out]
INFO is INTEGER
= 0: successful exit
< 0: if INFO = -i, the i-th argument had an illegal value