TESTING/LIN/dlaptm.f(3)

NAME
TESTING/LIN/dlaptm.f

SYNOPSIS

  Functions/Subroutines
subroutine dlaptm (n, nrhs, alpha, d, e, x, ldx, beta, b, ldb)
DLAPTM

Function/Subroutine Documentation

  subroutine dlaptm (integer n, integer nrhs, double precision alpha, double precision, dimension( * ) d, double precision, dimension( * ) e, double precision, dimension( ldx, * ) x, integer ldx, double precision beta, double precision, dimension( ldb, * ) b, integer ldb)

DLAPTM

Purpose:

    !>
    !> DLAPTM multiplies an N by NRHS matrix X by a symmetric tridiagonal
    !> matrix A and stores the result in a matrix B.  The operation has the
    !> form
    !>
    !>    B := alpha * A * X + beta * B
    !>
    !> where alpha may be either 1. or -1. and beta may be 0., 1., or -1.
    !>

Parameters
    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 1. or -1.; otherwise,
    !>          it is assumed to be 0.
    !>

    D

    !>          D is DOUBLE PRECISION array, dimension (N)
    !>          The n diagonal elements of the tridiagonal matrix A.
    !>

    E

    !>          E is DOUBLE PRECISION array, dimension (N-1)
    !>          The (n-1) subdiagonal or superdiagonal elements of A.
    !>

    X

    !>          X is DOUBLE PRECISION 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 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

    !>          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.

Definition at line 115 of file dlaptm.f.

Author

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