slagtm.f(3) [debian man page]

slagtm.f(3)							      LAPACK							       slagtm.f(3)

NAME

       slagtm.f -

SYNOPSIS

   Functions/Subroutines
       subroutine slagtm (TRANS, N, NRHS, ALPHA, DL, D, DU, X, LDX, BETA, B, LDB)
	   SLAGTM

Function/Subroutine Documentation
   subroutine slagtm (characterTRANS, integerN, integerNRHS, realALPHA, real, dimension( * )DL, real, dimension( * )D, real, dimension( * )DU,
       real, dimension( ldx, * )X, integerLDX, realBETA, real, dimension( ldb, * )B, integerLDB)
       SLAGTM

       Purpose:

	    SLAGTM performs a matrix-vector product of the form

	       B := alpha * A * X + beta * B

	    where A is a tridiagonal matrix of order N, B and X are N by NRHS
	    matrices, and alpha and beta are real scalars, each of which may be
	    0., 1., or -1.

       Parameters:
	   TRANS

		     TRANS is CHARACTER*1
		     Specifies the operation applied to A.
		     = 'N':  No transpose, B := alpha * A * X + beta * B
		     = 'T':  Transpose,    B := alpha * A'* X + beta * B
		     = 'C':  Conjugate transpose = Transpose

	   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 matrices X and B.

	   ALPHA

		     ALPHA is REAL
		     The scalar alpha.	ALPHA must be 0., 1., or -1.; otherwise,
		     it is assumed to be 0.

	   DL

		     DL is REAL array, dimension (N-1)
		     The (n-1) sub-diagonal elements of T.

	   D

		     D is REAL array, dimension (N)
		     The diagonal elements of T.

	   DU

		     DU is REAL array, dimension (N-1)
		     The (n-1) super-diagonal elements of T.

	   X

		     X is REAL array, dimension (LDX,NRHS)
		     The N by NRHS matrix X.

	   LDX

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

	   BETA

		     BETA is REAL
		     The scalar beta.  BETA must be 0., 1., or -1.; otherwise,
		     it is assumed to be 1.

	   B

		     B is REAL array, dimension (LDB,NRHS)
		     On entry, the N by NRHS matrix B.
		     On exit, B is overwritten by the matrix expression
		     B := alpha * A * X + beta * B.

	   LDB

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

       Author:
	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

       Date:
	   November 2011

       Definition at line 145 of file slagtm.f.

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

Version 3.4.1							  Sun May 26 2013						       slagtm.f(3)

Check Out this Related Man Page

SLAGTM(l)								 )								 SLAGTM(l)

NAME

       SLAGTM  -  perform  a matrix-vector product of the form	B := alpha * A * X + beta * B  where A is a tridiagonal matrix of order N, B and X
       are N by NRHS matrices, and alpha and beta are real scalars, each of which may be 0., 1., or -1

SYNOPSIS

       SUBROUTINE SLAGTM( TRANS, N, NRHS, ALPHA, DL, D, DU, X, LDX, BETA, B, LDB )

	   CHARACTER	  TRANS

	   INTEGER	  LDB, LDX, N, NRHS

	   REAL 	  ALPHA, BETA

	   REAL 	  B( LDB, * ), D( * ), DL( * ), DU( * ), X( LDX, * )

PURPOSE

       SLAGTM performs a matrix-vector product of the form B := alpha * A * X + beta * B where A is a tridiagonal matrix of order N, B and X are N
       by NRHS matrices, and alpha and beta are real scalars, each of which may be 0., 1., or -1.

ARGUMENTS

       TRANS   (input) CHARACTER
	       Specifies the operation applied to A.  = 'N':  No transpose, B := alpha * A * X + beta * B
	       = 'T':  Transpose,    B := alpha * A'* X + beta * B
	       = 'C':  Conjugate transpose = Transpose

       N       (input) INTEGER
	       The order of the matrix A.  N >= 0.

       NRHS    (input) INTEGER
	       The number of right hand sides, i.e., the number of columns of the matrices X and B.

       ALPHA   (input) REAL
	       The scalar alpha.  ALPHA must be 0., 1., or -1.; otherwise, it is assumed to be 0.

       DL      (input) REAL array, dimension (N-1)
	       The (n-1) sub-diagonal elements of T.

       D       (input) REAL array, dimension (N)
	       The diagonal elements of T.

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

       X       (input) REAL array, dimension (LDX,NRHS)
	       The N by NRHS matrix X.	LDX	(input) INTEGER The leading dimension of the array X.  LDX >= max(N,1).

       BETA    (input) REAL
	       The scalar beta.  BETA must be 0., 1., or -1.; otherwise, it is assumed to be 1.

       B       (input/output) REAL array, dimension (LDB,NRHS)
	       On entry, the N by NRHS matrix B.  On exit, B is overwritten by the matrix expression B := alpha * A * X + beta * B.

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

LAPACK version 3.0						   15 June 2000 							 SLAGTM(l)

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slagtm.f(3) [debian man page]

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