clagtm man page on Scientific

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CLAGTM(1)	    LAPACK auxiliary routine (version 3.2)	     CLAGTM(1)

NAME
       CLAGTM  - 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

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

	   CHARACTER	  TRANS

	   INTEGER	  LDB, LDX, N, NRHS

	   REAL		  ALPHA, BETA

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

PURPOSE
       CLAGTM performs a matrix-vector product of the form

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

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

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

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

       X       (input) COMPLEX 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) COMPLEX 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 auxiliary routine (versioNovember 2008			     CLAGTM(1)
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