LAPACK
3.4.2
LAPACK: Linear Algebra PACKage

Go to the source code of this file.
Functions/Subroutines  
subroutine  dlagtm (TRANS, N, NRHS, ALPHA, DL, D, DU, X, LDX, BETA, B, LDB) 
DLAGTM performs a matrixmatrix 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. 
subroutine dlagtm  (  character  TRANS, 
integer  N,  
integer  NRHS,  
double precision  ALPHA,  
double precision, dimension( * )  DL,  
double precision, dimension( * )  D,  
double precision, dimension( * )  DU,  
double precision, dimension( ldx, * )  X,  
integer  LDX,  
double precision  BETA,  
double precision, dimension( ldb, * )  B,  
integer  LDB  
) 
DLAGTM performs a matrixmatrix 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.
Download DLAGTM + dependencies [TGZ] [ZIP] [TXT]DLAGTM performs a matrixvector 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.
[in]  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 
[in]  N  N is INTEGER The order of the matrix A. N >= 0. 
[in]  NRHS  NRHS is INTEGER The number of right hand sides, i.e., the number of columns of the matrices X and B. 
[in]  ALPHA  ALPHA is DOUBLE PRECISION The scalar alpha. ALPHA must be 0., 1., or 1.; otherwise, it is assumed to be 0. 
[in]  DL  DL is DOUBLE PRECISION array, dimension (N1) The (n1) subdiagonal elements of T. 
[in]  D  D is DOUBLE PRECISION array, dimension (N) The diagonal elements of T. 
[in]  DU  DU is DOUBLE PRECISION array, dimension (N1) The (n1) superdiagonal elements of T. 
[in]  X  X is DOUBLE PRECISION array, dimension (LDX,NRHS) The N by NRHS matrix X. 
[in]  LDX  LDX is INTEGER The leading dimension of the array X. LDX >= max(N,1). 
[in]  BETA  BETA is DOUBLE PRECISION The scalar beta. BETA must be 0., 1., or 1.; otherwise, it is assumed to be 1. 
[in,out]  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. 
[in]  LDB  LDB is INTEGER The leading dimension of the array B. LDB >= max(N,1). 
Definition at line 145 of file dlagtm.f.