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dlagtm.f(3) | LAPACK | dlagtm.f(3) |
NAME¶
dlagtm.f -SYNOPSIS¶
Functions/Subroutines¶
subroutine dlagtm (TRANS, N, NRHS, ALPHA, DL, D, DU, X, LDX, BETA, B, LDB)
Function/Subroutine Documentation¶
subroutine dlagtm (characterTRANS, integerN, integerNRHS, double precisionALPHA, double precision, dimension( * )DL, double precision, dimension( * )D, double precision, dimension( * )DU, double precision, dimension( ldx, * )X, integerLDX, double precisionBETA, double precision, dimension( ldb, * )B, integerLDB)¶
DLAGTM 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:DLAGTM 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.
TRANS
Author:
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 = TransposeN
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 DOUBLE PRECISION array, dimension (N-1) The (n-1) sub-diagonal elements of T.D
D is DOUBLE PRECISION array, dimension (N) The diagonal elements of T.DU
DU is DOUBLE PRECISION array, dimension (N-1) The (n-1) super-diagonal elements of T.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).
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date:
September 2012
Definition at line 145 of file dlagtm.f.
Author¶
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