TESTING/LIN/slaptm.f(3)

NAME
TESTING/LIN/slaptm.f

SYNOPSIS

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

Function/Subroutine Documentation

  subroutine slaptm (integer n, integer nrhs, real alpha, real, dimension( * ) d, real, dimension( * ) e, real, dimension( ldx, * ) x, integer ldx, real beta, real, dimension( ldb, * ) b, integer ldb)

SLAPTM

Purpose:

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

    D

              D is REAL array, dimension (N)
              The n diagonal elements of the tridiagonal matrix A.

    E

              E is REAL array, dimension (N-1)
              The (n-1) subdiagonal or superdiagonal elements of A.

    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.

Definition at line 115 of file slaptm.f.

Author

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