cpttrf.f man page on Oracle

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```cpttrf.f(3)			    LAPACK			   cpttrf.f(3)

NAME
cpttrf.f -

SYNOPSIS
Functions/Subroutines
subroutine cpttrf (N, D, E, INFO)
CPTTRF

Function/Subroutine Documentation
subroutine cpttrf (integerN, real, dimension( * )D, complex, dimension( *
)E, integerINFO)
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

NAG Ltd.

Date:
September 2012

Definition at line 93 of file cpttrf.f.

Author
Generated automatically by Doxygen for LAPACK from the source code.

Version 3.4.2			Tue Sep 25 2012			   cpttrf.f(3)
```
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