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

sgtsv.f(3)				      LAPACK				       sgtsv.f(3)

NAME
       sgtsv.f -

SYNOPSIS
   Functions/Subroutines
       subroutine sgtsv (N, NRHS, DL, D, DU, B, LDB, INFO)
	    SGTSV computes the solution to system of linear equations A * X = B for GT matrices

Function/Subroutine Documentation
   subroutine sgtsv (integerN, integerNRHS, real, dimension( * )DL, real, dimension( * )D, real,
       dimension( * )DU, real, dimension( ldb, * )B, integerLDB, integerINFO)
	SGTSV computes the solution to system of linear equations A * X = B for GT matrices

       Purpose:

	    SGTSV  solves the equation

	       A*X = B,

	    where A is an n by n tridiagonal matrix, by Gaussian elimination with
	    partial pivoting.

	    Note that the equation  A**T*X = B	may be solved by interchanging the
	    order of the arguments DU and DL.

       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.

	   DL

		     DL is REAL array, dimension (N-1)
		     On entry, DL must contain the (n-1) sub-diagonal elements of
		     A.

		     On exit, DL is overwritten by the (n-2) elements of the
		     second super-diagonal of the upper triangular matrix U from
		     the LU factorization of A, in DL(1), ..., DL(n-2).

	   D

		     D is REAL array, dimension (N)
		     On entry, D must contain the diagonal elements of A.

		     On exit, D is overwritten by the n diagonal elements of U.

	   DU

		     DU is REAL array, dimension (N-1)
		     On entry, DU must contain the (n-1) super-diagonal elements
		     of A.

		     On exit, DU is overwritten by the (n-1) elements of the first
		     super-diagonal of U.

	   B

		     B is REAL array, dimension (LDB,NRHS)
		     On entry, the N by NRHS matrix of 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, U(i,i) is exactly zero, 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 128 of file sgtsv.f.

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

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


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