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RedHat 9 (Linux i386) - man page for sgttrs (redhat section l)

SGTTRS(l)					)					SGTTRS(l)

NAME
       SGTTRS - solve one of the systems of equations A*X = B or A'*X = B,

SYNOPSIS
       SUBROUTINE SGTTRS( TRANS, N, NRHS, DL, D, DU, DU2, IPIV, B, LDB, INFO )

	   CHARACTER	  TRANS

	   INTEGER	  INFO, LDB, N, NRHS

	   INTEGER	  IPIV( * )

	   REAL 	  B( LDB, * ), D( * ), DL( * ), DU( * ), DU2( * )

PURPOSE
       SGTTRS  solves  one  of	the  systems of equations A*X = B or A'*X = B, with a tridiagonal
       matrix A using the LU factorization computed by SGTTRF.

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

       N       (input) INTEGER
	       The order of the matrix A.

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

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

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

       DU      (input) REAL array, dimension (N-1)
	       The (n-1) elements of the first super-diagonal of U.

       DU2     (input) REAL array, dimension (N-2)
	       The (n-2) elements of the second super-diagonal of U.

       IPIV    (input) 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       (input/output) REAL 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     (input) INTEGER
	       The leading dimension of the array B.  LDB >= max(1,N).

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

LAPACK version 3.0			   15 June 2000 				SGTTRS(l)


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