*nix Documentation Project
·  Home
 +   man pages
·  Linux HOWTOs
·  FreeBSD Tips
·  *niX Forums

  man pages->IRIX man pages -> complib/DPODI (3)              
Title
Content
Arch
Section
 

Contents


DPODI(3F)							     DPODI(3F)


NAME    [Toc]    [Back]

     DPODI   - DPODI computes the determinant and inverse of a certain double
     precision symmetric positive definite matrix (see below) using the
     factors computed by DPOCO,	DPOFA or DQRDC.

SYNOPSYS    [Toc]    [Back]

      SUBROUTINE DPODI(A,LDA,N,DET,JOB)

DESCRIPTION    [Toc]    [Back]

     On	Entry

     A DOUBLE PRECISION(LDA, N)
	the output  A  from DPOCO or DPOFA
	or the output  X  from DQRDC.

     LDA INTEGER
	the leading dimension of the array  A .

     N INTEGER
	the order of the matrix	 A .

     JOB INTEGER
	= 11   both determinant	and inverse.
	= 01   inverse only.
	= 10   determinant only.  On Return

     A If DPOCO	or DPOFA was used to factor  A , then
	DPODI produces the upper half of INVERSE(A) .
	If DQRDC was used to decompose	X , then
	DPODI produces the upper half of inverse(TRANS(X)*X)
	where TRANS(X) is the transpose.
	Elements of  A	below the diagonal are unchanged.
	If the units digit of JOB is zero,  A  is unchanged.

     DET DOUBLE	PRECISION(2)
	determinant of	A  or of  TRANS(X)*X  if requested.
	Otherwise not referenced.
	Determinant = DET(1) * 10.0**DET(2)
	with  1.0 .LE. DET(1) .LT. 10.0
	or  DET(1) .EQ.	0.0 .  Error Condition

     A division	by zero	will occur if the input	factor contains	a zero on the
     diagonal and the inverse is requested.  It	will not occur if the
     subroutines are called correctly and if DPOCO or DPOFA has	set INFO .EQ.
     0 .  LINPACK.  This version dated 08/14/78	.  Cleve Moler,	University of
     New Mexico, Argonne National Lab.	Subroutines and	Functions BLAS
     DAXPY,DSCAL Fortran MOD


									PPPPaaaaggggeeee 1111
[ Back ]
 Similar pages
Name OS Title
DPPDI IRIX DPPDI computes the determinant and inverse of a double precision symmetric positive definite matrix using the
DPBDI IRIX DPBDI computes the determinant of a double precision symmetric positive definite band matrix using the factors
DSPDI IRIX DSPDI computes the determinant, inertia and inverse of a double precision symmetric matrix using the factors f
DSIDI IRIX DSIDI computes the determinant, inertia and inverse of a double precision symmetric matrix using the factors f
SPODI IRIX SPODI computes the determinant and inverse of a certain real symmetric positive definite matrix (see below) us
SPPDI IRIX SPPDI computes the determinant and inverse of a real symmetric positive definite matrix using the factors comp
DTRDI IRIX DTRDI computes the determinant and inverse of a double precision triangular matrix.
CPODI IRIX CPODI computes the determinant and inverse of a certain complex Hermitian positive definite matrix (see below)
CPPDI IRIX CPPDI computes the determinant and inverse of a complex Hermitian positive definite matrix using the factors c
SPBDI IRIX SPBDI computes the determinant of a real symmetric positive definite band matrix using the factors computed by
Copyright © 2004-2005 DeniX Solutions SRL
newsletter delivery service