cpptri-f(3)

cpptri.f –

Synopsis

Functions/Subroutines

subroutine cpptri (UPLO, N, AP, INFO)
CPPTRI

Function/Subroutine Documentation

subroutine cpptri (characterUPLO, integerN, complex, dimension( * )AP, integerINFO)

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.

Date:

November 2011

Definition at line 94 of file cpptri.f.

Author

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