cpptri.f

Section: LAPACK (3)
Updated: Tue Nov 14 2017
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NAME

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.

Date:

December 2016

Definition at line 95 of file cpptri.f.  

Author

Generated automatically by Doxygen for LAPACK from the source code.


 

Index

NAME
SYNOPSIS
Functions/Subroutines
Function/Subroutine Documentation
subroutine cpptri (character UPLO, integer N, complex, dimension( * ) AP, integer INFO)
Author
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