SRC/ztrttp.f(3) | Library Functions Manual | SRC/ztrttp.f(3) |
NAME
SRC/ztrttp.f
SYNOPSIS
Functions/Subroutines
subroutine ztrttp (uplo, n, a, lda, ap, info)
ZTRTTP copies a triangular matrix from the standard full format (TR) to
the standard packed format (TP).
Function/Subroutine Documentation
subroutine ztrttp (character uplo, integer n, complex*16, dimension( lda, * ) a, integer lda, complex*16, dimension( * ) ap, integer info)
ZTRTTP copies a triangular matrix from the standard full format (TR) to the standard packed format (TP).
Purpose:
ZTRTTP copies a triangular matrix A from full format (TR) to standard packed format (TP).
Parameters
UPLO
UPLO is CHARACTER*1 = 'U': A is upper triangular; = 'L': A is lower triangular.
N
N is INTEGER The order of the matrices AP and A. N >= 0.
A
A is COMPLEX*16 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
LDA is INTEGER The leading dimension of the array A. LDA >= max(1,N).
AP
AP is COMPLEX*16 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
INFO is INTEGER = 0: successful exit < 0: if INFO = -i, the i-th argument had an illegal value
Author
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Definition at line 103 of file ztrttp.f.
Author
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