cpptri.f - Man Page
SRC/cpptri.f
Synopsis
Functions/Subroutines
subroutine cpptri (uplo, n, ap, info)
CPPTRI
Function/Subroutine Documentation
subroutine cpptri (character uplo, integer n, complex, dimension( * ) ap, integer info)
CPPTRI
Purpose:
CPPTRI computes the inverse of a complex Hermitian positive definite matrix A using the Cholesky factorization A = U**H*U or A = L*L**H computed by CPPTRF.
- Parameters
UPLO
UPLO is CHARACTER*1 = 'U': Upper triangular factor is stored in AP; = 'L': Lower triangular factor is stored in AP.
N
N is INTEGER The order of the matrix A. N >= 0.
AP
AP is COMPLEX array, dimension (N*(N+1)/2) On entry, the triangular factor U or L from the Cholesky factorization A = U**H*U or A = L*L**H, packed columnwise as a linear array. The j-th column of U or L is stored in the array AP as follows: if UPLO = 'U', AP(i + (j-1)*j/2) = U(i,j) for 1<=i<=j; if UPLO = 'L', AP(i + (j-1)*(2n-j)/2) = L(i,j) for j<=i<=n. On exit, the upper or lower triangle of the (Hermitian) inverse of A, overwriting the input factor U or L.
INFO
INFO is INTEGER = 0: successful exit < 0: if INFO = -i, the i-th argument had an illegal value > 0: if INFO = i, the (i,i) element of the factor U or L is zero, and the inverse could not be computed.
- Author
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Definition at line 92 of file cpptri.f.
Author
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Referenced By
The man page cpptri(3) is an alias of cpptri.f(3).
Tue Nov 28 2023 12:08:41 Version 3.12.0 LAPACK