LAPACK
3.4.2
LAPACK: Linear Algebra PACKage

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Functions/Subroutines  
subroutine  dtrttp (UPLO, N, A, LDA, AP, INFO) 
DTRTTP copies a triangular matrix from the standard full format (TR) to the standard packed format (TP). 
subroutine dtrttp  (  character  UPLO, 
integer  N,  
double precision, dimension( lda, * )  A,  
integer  LDA,  
double precision, dimension( * )  AP,  
integer  INFO  
) 
DTRTTP copies a triangular matrix from the standard full format (TR) to the standard packed format (TP).
Download DTRTTP + dependencies [TGZ] [ZIP] [TXT]DTRTTP copies a triangular matrix A from full format (TR) to standard packed format (TP).
[in]  UPLO  UPLO is CHARACTER*1 = 'U': A is upper triangular. = 'L': A is lower triangular. 
[in]  N  N is INTEGER The order of the matrices AP and A. N >= 0. 
[in]  A  A is DOUBLE PRECISION array, dimension (LDA,N) On exit, the triangular matrix A. If UPLO = 'U', the leading NbyN 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 NbyN 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. 
[in]  LDA  LDA is INTEGER The leading dimension of the array A. LDA >= max(1,N). 
[out]  AP  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 jth column of A is stored in the array AP as follows: if UPLO = 'U', AP(i + (j1)*j/2) = A(i,j) for 1<=i<=j; if UPLO = 'L', AP(i + (j1)*(2nj)/2) = A(i,j) for j<=i<=n. 
[out]  INFO  INFO is INTEGER = 0: successful exit < 0: if INFO = i, the ith argument had an illegal value 
Definition at line 105 of file dtrttp.f.