
NAMEzlagtm.f SYNOPSISFunctions/Subroutinessubroutine zlagtm (TRANS, N, NRHS, ALPHA, DL, D, DU, X, LDX, BETA, B, LDB) Function/Subroutine Documentationsubroutine zlagtm (characterTRANS, integerN, integerNRHS, double precisionALPHA, complex*16, dimension( * )DL, complex*16, dimension( * )D, complex*16, dimension( * )DU, complex*16, dimension( ldx, * )X, integerLDX, double precisionBETA, complex*16, dimension( ldb, * )B, integerLDB)ZLAGTM 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. Purpose:ZLAGTM 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. 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**T * X + beta * B = 'C': Conjugate transpose, B := alpha * A**H * X + beta * BN 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 COMPLEX*16 array, dimension (N1) The (n1) subdiagonal elements of T.D D is COMPLEX*16 array, dimension (N) The diagonal elements of T.DU DU is COMPLEX*16 array, dimension (N1) The (n1) superdiagonal elements of T.X X is COMPLEX*16 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 COMPLEX*16 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 zlagtm.f.
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