CTRTTP(3)
copies a triangular matrix A from full format (TR) to standard packed format (TP)
SYNOPSIS
- SUBROUTINE CTRTTP(
-
UPLO, N, A, LDA, AP, INFO )
-
CHARACTER
UPLO
-
INTEGER
INFO, N, LDA
-
COMPLEX
A( LDA, * ), AP( * )
PURPOSE
CTRTTP copies a triangular matrix A from full format (TR) to standard
packed format (TP).
ARGUMENTS
- UPLO (input) CHARACTER
-
= 'U': A is upper triangular;
= 'L': A is lower triangular.
- N (input) INTEGER
-
The order of the matrices AP and A. N >= 0.
- A (input) COMPLEX array, dimension (LDA,N)
-
On entry, 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).
- AP (output) COMPLEX 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 (output) INTEGER
-
= 0: successful exit
< 0: if INFO = -i, the i-th argument had an illegal value