Home Man
Search
Today's Posts
Register

Linux & Unix Commands - Search Man Pages

CentOS 7.0 - man page for dgtts2.f (centos section 3)

dgtts2.f(3)				      LAPACK				      dgtts2.f(3)

NAME
       dgtts2.f -

SYNOPSIS
   Functions/Subroutines
       subroutine dgtts2 (ITRANS, N, NRHS, DL, D, DU, DU2, IPIV, B, LDB)
	   DGTTS2 solves a system of linear equations with a tridiagonal matrix using the LU
	   factorization computed by sgttrf.

Function/Subroutine Documentation
   subroutine dgtts2 (integerITRANS, integerN, integerNRHS, double precision, dimension( * )DL,
       double precision, dimension( * )D, double precision, dimension( * )DU, double precision,
       dimension( * )DU2, integer, dimension( * )IPIV, double precision, dimension( ldb, * )B,
       integerLDB)
       DGTTS2 solves a system of linear equations with a tridiagonal matrix using the LU
       factorization computed by sgttrf.

       Purpose:

	    DGTTS2 solves one of the systems of equations
	       A*X = B	or  A**T*X = B,
	    with a tridiagonal matrix A using the LU factorization computed
	    by DGTTRF.

       Parameters:
	   ITRANS

		     ITRANS is INTEGER
		     Specifies the form of the system of equations.
		     = 0:  A * X = B  (No transpose)
		     = 1:  A**T* X = B	(Transpose)
		     = 2:  A**T* X = B	(Conjugate transpose = Transpose)

	   N

		     N is INTEGER
		     The order of the matrix A.

	   NRHS

		     NRHS is INTEGER
		     The number of right hand sides, i.e., the number of columns
		     of the matrix B.  NRHS >= 0.

	   DL

		     DL is DOUBLE PRECISION array, dimension (N-1)
		     The (n-1) multipliers that define the matrix L from the
		     LU factorization of A.

	   D

		     D is DOUBLE PRECISION array, dimension (N)
		     The n diagonal elements of the upper triangular matrix U from
		     the LU factorization of A.

	   DU

		     DU is DOUBLE PRECISION array, dimension (N-1)
		     The (n-1) elements of the first super-diagonal of U.

	   DU2

		     DU2 is DOUBLE PRECISION array, dimension (N-2)
		     The (n-2) elements of the second super-diagonal of U.

	   IPIV

		     IPIV is INTEGER array, dimension (N)
		     The pivot indices; for 1 <= i <= n, row i of the matrix was
		     interchanged with row IPIV(i).  IPIV(i) will always be either
		     i or i+1; IPIV(i) = i indicates a row interchange was not
		     required.

	   B

		     B is DOUBLE PRECISION array, dimension (LDB,NRHS)
		     On entry, the matrix of right hand side vectors B.
		     On exit, B is overwritten by the solution vectors X.

	   LDB

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

       Author:
	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

       Date:
	   September 2012

       Definition at line 129 of file dgtts2.f.

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

Version 3.4.2				 Tue Sep 25 2012			      dgtts2.f(3)


All times are GMT -4. The time now is 11:43 AM.

Unix & Linux Forums Content Copyrightę1993-2018. All Rights Reserved.
UNIX.COM Login
Username:
Password:  
Show Password