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/home/abuild/rpmbuild/BUILD/lapack-3.12.0/TESTING/LIN/dlaptm.f(3) Library Functions Manual /home/abuild/rpmbuild/BUILD/lapack-3.12.0/TESTING/LIN/dlaptm.f(3)

NAME

/home/abuild/rpmbuild/BUILD/lapack-3.12.0/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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Version 3.12.0 LAPACK