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dlagtm (3)
  • >> dlagtm (3) ( Solaris man: Библиотечные вызовы )
  • 
    NAME
         dlagtm - perform 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 zero, one, or minus
         one
    
    SYNOPSIS
         SUBROUTINE DLAGTM( TRANS, N, NRHS, ALPHA, DL, D, DU, X, LDX,
                   BETA, B, LDB )
    
         CHARACTER TRANS
    
         INTEGER LDB, LDX, N, NRHS
    
         DOUBLE PRECISION ALPHA, BETA
    
         DOUBLE PRECISION B( LDB, * ), D( * ), DL( * ), DU( *  ),  X(
                   LDX, * )
    
    
    
         #include <sunperf.h>
    
         void dlagtm(char trans, int n, int nrhs, double alpha,  dou-
                   ble  *dl,  double  *d, double *du, double *dx, int
                   ldx, double dbeta, double *db, int ldb) ;
    
    PURPOSE
         DLAGTM performs a matrix-vector product of the form
    
    
    ARGUMENTS
         TRANS     (input) CHARACTER
                   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         (input) INTEGER
                   The order of the matrix A.  N >= 0.
    
         NRHS      (input) INTEGER
                   The number of right hand sides, i.e.,  the  number
                   of columns of the matrices X and B.
    
         ALPHA     (input) DOUBLE PRECISION
                   The scalar alpha.  ALPHA must be 0., 1.,  or  -1.;
                   otherwise, it is assumed to be 0.
    
         DL        (input) DOUBLE PRECISION array, dimension (N-1)
                   The (n-1) sub-diagonal elements of T.
    
         D         (input) DOUBLE PRECISION array, dimension (N)
                   The diagonal elements of T.
    
         DU        (input) DOUBLE PRECISION array, dimension (N-1)
                   The (n-1) super-diagonal elements of T.
    
         X         (input)   DOUBLE   PRECISION   array,    dimension
                   (LDX,NRHS)
                   The N by NRHS matrix X.  LDX      (input)  INTEGER
                   The  leading  dimension  of  the  array X.  LDX >=
                   max(N,1).
    
         BETA      (input) DOUBLE PRECISION
                   The scalar beta.  BETA must be  0.,  1.,  or  -1.;
                   otherwise, it is assumed to be 1.
    
         B         (input/output) 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       (input) INTEGER
                   The leading dimension of  the  array  B.   LDB  >=
                   max(N,1).
    
    
    
    


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