dpptri man page on Scientific

Man page or keyword search:  
man Server   26626 pages
apropos Keyword Search (all sections)
Output format
Scientific logo
[printable version]

DPPTRI(1)		 LAPACK routine (version 3.2)		     DPPTRI(1)

NAME
       DPPTRI  -  computes  the	 inverse of a real symmetric positive definite
       matrix A using the Cholesky factorization A = U**T*U or A = L*L**T com‐
       puted by DPPTRF

SYNOPSIS
       SUBROUTINE DPPTRI( UPLO, N, AP, INFO )

	   CHARACTER	  UPLO

	   INTEGER	  INFO, N

	   DOUBLE	  PRECISION AP( * )

PURPOSE
       DPPTRI  computes	 the  inverse  of  a  real symmetric positive definite
       matrix A using the Cholesky factorization A = U**T*U or A = L*L**T com‐
       puted by DPPTRF.

ARGUMENTS
       UPLO    (input) CHARACTER*1
	       = 'U':  Upper triangular factor is stored in AP;
	       = 'L':  Lower triangular factor is stored in AP.

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

       AP      (input/output) DOUBLE PRECISION array, dimension (N*(N+1)/2)
	       On  entry,  the triangular factor U or L from the Cholesky fac‐
	       torization A = U**T*U or A = L*L**T,  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  (symmet‐
	       ric) inverse of A, overwriting the input factor U or L.

       INFO    (output) 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.

 LAPACK routine (version 3.2)	 November 2008			     DPPTRI(1)
[top]

List of man pages available for Scientific

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