dlagtm man page on Scientific

```DLAGTM(1)	    LAPACK auxiliary routine (version 3.2)	     DLAGTM(1)

NAME
DLAGTM  - 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 DLAGTM( TRANS, N, NRHS, ALPHA, DL, D, DU, X, LDX,  BETA,  B,
LDB )

CHARACTER	  TRANS

INTEGER	  LDB, LDX, N, NRHS

DOUBLE	  PRECISION ALPHA, BETA

DOUBLE	  PRECISION  B( LDB, * ), D( * ), DL( * ), DU( * ), X(
LDX, * )

PURPOSE
DLAGTM 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'* 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) DOUBLE PRECISION
The scalar alpha.  ALPHA must be 0., 1., or -1.; otherwise,  it
is assumed to be 0.

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

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

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

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

B       (input/output) DOUBLE PRECISION 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			     DLAGTM(1)
```
[top]

List of man pages available for Scientific

Copyright (c) for man pages and the logo by the respective OS vendor.

For those who want to learn more, the polarhome community provides shell access and support.

 Vote for polarhome  