zlagtm.f(3)

NAME
zlagtm.f -

SYNOPSIS

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

Function/Subroutine Documentation

  subroutine ZLAGTM (CHARACTERTRANS, INTEGERN, INTEGERNRHS, DOUBLE PRECISIONALPHA, COMPLEX*16, dimension( * )DL, COMPLEX*16, dimension( * )D, COMPLEX*16, dimension( * )DU, COMPLEX*16, dimension( ldx, * )X, INTEGERLDX, DOUBLE PRECISIONBETA, COMPLEX*16, dimension( ldb, * )B, INTEGERLDB)

ZLAGTM

Purpose:

     ZLAGTM 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**T * X + beta * B
              = 'C':  Conjugate transpose, B := alpha * A**H * X + beta * B

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

    DL

              DL is COMPLEX*16 array, dimension (N-1)
              The (n-1) sub-diagonal elements of T.

    D

              D is COMPLEX*16 array, dimension (N)
              The diagonal elements of T.

    DU

              DU is COMPLEX*16 array, dimension (N-1)
              The (n-1) super-diagonal elements of T.

    X

              X is COMPLEX*16 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 DOUBLE PRECISION
              The scalar beta.  BETA must be 0., 1., or -1.; otherwise,
              it is assumed to be 1.

    B

              B is COMPLEX*16 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 zlagtm.f'.

Author

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