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/home/abuild/rpmbuild/BUILD/lapack-3.12.0/SRC/slagtm.f(3) Library Functions Manual /home/abuild/rpmbuild/BUILD/lapack-3.12.0/SRC/slagtm.f(3)

NAME

/home/abuild/rpmbuild/BUILD/lapack-3.12.0/SRC/slagtm.f

SYNOPSIS

Functions/Subroutines


subroutine SLAGTM (trans, n, nrhs, alpha, dl, d, du, x, ldx, beta, b, ldb)
SLAGTM performs a matrix-matrix product of the form C = αAB+βC, where A is a tridiagonal matrix, B and C are rectangular matrices, and α and β are scalars, which may be 0, 1, or -1.

Function/Subroutine Documentation

subroutine SLAGTM (character trans, integer n, integer nrhs, real alpha, real, dimension( * ) dl, real, dimension( * ) d, real, dimension( * ) du, real, dimension( ldx, * ) x, integer ldx, real beta, real, dimension( ldb, * ) b, integer ldb)

SLAGTM performs a matrix-matrix product of the form C = αAB+βC, where A is a tridiagonal matrix, B and C are rectangular matrices, and α and β are scalars, which may be 0, 1, or -1.

Purpose:

!>
!> SLAGTM performs a matrix-matrix 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'* X + beta * B
!>          = 'C':  Conjugate transpose = Transpose
!>

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

DL

!>          DL is REAL array, dimension (N-1)
!>          The (n-1) sub-diagonal elements of T.
!>

D

!>          D is REAL array, dimension (N)
!>          The diagonal elements of T.
!>

DU

!>          DU is REAL array, dimension (N-1)
!>          The (n-1) super-diagonal elements of T.
!>

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 143 of file slagtm.f.

Author

Generated automatically by Doxygen for LAPACK from the source code.

Version 3.12.0 LAPACK