chptri man page on YellowDog

Man page or keyword search:  
man Server   18644 pages
apropos Keyword Search (all sections)
Output format
YellowDog logo
[printable version]

CHPTRI(l)			       )			     CHPTRI(l)

NAME
       CHPTRI - compute the inverse of a complex Hermitian indefinite matrix A
       in packed storage using the factorization A = U*D*U**H or A =  L*D*L**H
       computed by CHPTRF

SYNOPSIS
       SUBROUTINE CHPTRI( UPLO, N, AP, IPIV, WORK, INFO )

	   CHARACTER	  UPLO

	   INTEGER	  INFO, N

	   INTEGER	  IPIV( * )

	   COMPLEX	  AP( * ), WORK( * )

PURPOSE
       CHPTRI  computes the inverse of a complex Hermitian indefinite matrix A
       in packed storage using the factorization A = U*D*U**H or A =  L*D*L**H
       computed by CHPTRF.

ARGUMENTS
       UPLO    (input) CHARACTER*1
	       Specifies  whether  the details of the factorization are stored
	       as an upper or lower triangular matrix.	= 'U':	Upper trianguā€
	       lar, form is A = U*D*U**H;
	       = 'L':  Lower triangular, form is A = L*D*L**H.

       N       (input) INTEGER
	       The order of the matrix A.  N >= 0.

       AP      (input/output) COMPLEX array, dimension (N*(N+1)/2)
	       On  entry, the block diagonal matrix D and the multipliers used
	       to obtain the factor U or L as computed by CHPTRF, stored as  a
	       packed triangular matrix.

	       On  exit,  if INFO = 0, the (Hermitian) inverse of the original
	       matrix, stored as a packed triangular matrix. The  j-th	column
	       of  inv(A) is stored in the array AP as follows: if UPLO = 'U',
	       AP(i + (j-1)*j/2) = inv(A)(i,j) for 1<=i<=j;  if	 UPLO  =  'L',
	       AP(i + (j-1)*(2n-j)/2) = inv(A)(i,j) for j<=i<=n.

       IPIV    (input) INTEGER array, dimension (N)
	       Details	of  the	 interchanges  and the block structure of D as
	       determined by CHPTRF.

       WORK    (workspace) COMPLEX array, dimension (N)

       INFO    (output) INTEGER
	       = 0: successful exit
	       < 0: if INFO = -i, the i-th argument had an illegal value
	       > 0: if INFO = i, D(i,i) = 0; the matrix is  singular  and  its
	       inverse could not be computed.

LAPACK version 3.0		 15 June 2000			     CHPTRI(l)
[top]

List of man pages available for YellowDog

Copyright (c) for man pages and the logo by the respective OS vendor.

For those who want to learn more, the polarhome community provides shell access and support.

[legal] [privacy] [GNU] [policy] [cookies] [netiquette] [sponsors] [FAQ]
Tweet
Polarhome, production since 1999.
Member of Polarhome portal.
Based on Fawad Halim's script.
....................................................................
Vote for polarhome
Free Shell Accounts :: the biggest list on the net