cptsv.f man page on Oracle

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```cptsv.f(3)			    LAPACK			    cptsv.f(3)

NAME
cptsv.f -

SYNOPSIS
Functions/Subroutines
subroutine cptsv (N, NRHS, D, E, B, LDB, INFO)
CPTSV computes the solution to system of linear equations A * X =
B for PT matrices

Function/Subroutine Documentation
subroutine cptsv (integerN, integerNRHS, real, dimension( * )D, complex,
dimension( * )E, complex, dimension( ldb, * )B, integerLDB,
integerINFO)
CPTSV computes the solution to system of linear equations A * X = B
for PT matrices

Purpose:

CPTSV computes the solution to a complex system of linear equations
A*X = B, where A is an N-by-N Hermitian positive definite tridiagonal
matrix, and X and B are N-by-NRHS matrices.

A is factored as A = L*D*L**H, and the factored form of A is then
used to solve the system of equations.

Parameters:
N

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

NRHS

NRHS is INTEGER
The number of right hand sides, i.e., the number of columns
of the matrix B.  NRHS >= 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 factorization A = L*D*L**H.

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.

B

B is COMPLEX array, dimension (LDB,NRHS)
On entry, the N-by-NRHS right hand side matrix B.
On exit, if INFO = 0, the N-by-NRHS solution matrix X.

LDB

LDB is INTEGER
The leading dimension of the array B.  LDB >= max(1,N).

INFO

INFO is INTEGER
= 0:  successful exit
< 0:  if INFO = -i, the i-th argument had an illegal value
> 0:  if INFO = i, the leading minor of order i is not
positive definite, and the solution has not been
computed.  The factorization has not been completed
unless i = N.

Author:
Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Date:
September 2012

Definition at line 116 of file cptsv.f.

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

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