cpttrf.f

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

cpttrf.f  

SYNOPSIS


 

Functions/Subroutines


subroutine cpttrf (N, D, E, INFO)
CPTTRF  

Function/Subroutine Documentation

 

subroutine cpttrf (integer N, real, dimension( * ) D, complex, dimension( * ) E, integer INFO)

CPTTRF

Purpose:

 CPTTRF computes the L*D*L**H factorization of a complex Hermitian
 positive definite tridiagonal matrix A.  The factorization may also
 be regarded as having the form A = U**H *D*U.


 

Parameters:

N

          N is INTEGER
          The order of the matrix A.  N >= 0.


D

          D is REAL array, dimension (N)
          On entry, the n diagonal elements of the tridiagonal matrix
          A.  On exit, the n diagonal elements of the diagonal matrix
          D from the L*D*L**H factorization of A.


E

          E is COMPLEX array, dimension (N-1)
          On entry, the (n-1) subdiagonal elements of the tridiagonal
          matrix A.  On exit, the (n-1) subdiagonal elements of the
          unit bidiagonal factor L from the L*D*L**H factorization of A.
          E can also be regarded as the superdiagonal of the unit
          bidiagonal factor U from the U**H *D*U factorization of A.


INFO

          INFO is INTEGER
          = 0: successful exit
          < 0: if INFO = -k, the k-th argument had an illegal value
          > 0: if INFO = k, the leading minor of order k is not
               positive definite; if k < N, the factorization could not
               be completed, while if k = N, the factorization was
               completed, but D(N) <= 0.


 

Author:

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Date:

December 2016

Definition at line 94 of file cpttrf.f.  

Author

Generated automatically by Doxygen for LAPACK from the source code.


 

Index

NAME
SYNOPSIS
Functions/Subroutines
Function/Subroutine Documentation
subroutine cpttrf (integer N, real, dimension( * ) D, complex, dimension( * ) E, integer INFO)
Author