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CentOS 7.0 - man page for dgttrs (centos section 3)

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dgttrs.f(3)				      LAPACK				      dgttrs.f(3)

NAME
       dgttrs.f -

SYNOPSIS
   Functions/Subroutines
       subroutine dgttrs (TRANS, N, NRHS, DL, D, DU, DU2, IPIV, B, LDB, INFO)
	   DGTTRS

Function/Subroutine Documentation
   subroutine dgttrs (characterTRANS, 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, integerINFO)
       DGTTRS

       Purpose:

	    DGTTRS 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:
	   TRANS

		     TRANS is CHARACTER*1
		     Specifies the form of the system of equations.
		     = 'N':  A * X = B	(No transpose)
		     = 'T':  A**T* X = B  (Transpose)
		     = 'C':  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).

	   INFO

		     INFO is INTEGER
		     = 0:  successful exit
		     < 0:  if INFO = -i, the i-th argument had an illegal value

       Author:
	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

       Date:
	   September 2012

       Definition at line 138 of file dgttrs.f.

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

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


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