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dsttrs (3)
  • >> dsttrs (3) ( Solaris man: Библиотечные вызовы )
  • 
    NAME
         dsttrs - computes the solution to a double precision  system
         of linear equations A * X = B
    
    SYNOPSIS
         SUBROUTINE DSTTRS(N, NRHS, L, D, SUBL, B, LDB, IPIV, INFO )
    
         INTEGER           N, NRHS, LDB, IPIV( * ), INFO
    
         DOUBLE PRECISION  D( * ), L( * ), SUBL( * ), B( * )
    
    
    
         #include <sunperf.h>
    
         void dsttrs(int n, int nrhs, double *l,  double  *d,  double
                   *subl, double *b, int ldb, int *ipiv, int *info) ;
    
    PURPOSE
         DSTTRS computes the solution to a double precision system of
         linear  equations  A * X = B, where A is an N-by-N symmetric
         tridiagonal matrix and X and B are N-by-NRHS matrices.
    
    
    ARGUMENTS
         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 matrix B. NRHS >= 0.
    
         L         (input) DOUBLE PRECISION array, dimension (N-1)
                   On entry, the subdiagonal elements of LL and DD.
    
         D         (input) DOUBLE PRECISION array, dimension (N)
                   On entry, the diagonal elements of DD.
    
         SUBL      (input) DOUBLE PRECISION array, dimension (N-2)
                   On entry, the second subdiagonal elements of LL.
    
         B         (input/output) DOUBLE PRECISION array, dimension
                   (LDB, NRHS) On entry,  the  N-by-NRHS  right  hand
                   side  matrix  B.   On exit, if INFO = 0, the N-by-
                   NRHS solution matrix X.
    
         LDB       (input) INTEGER
                   The leading dimension of  the  array  B.   LDB  >=
                   max(1, N)
    
         IPIV      (output) INTEGER array, dimension (N)
                   Details of the interchanges and block  pivot.   If
                   IPIV(K)  > 0, 1 by 1 pivot, and if IPIV(K) = K + 1
                   an interchange done;  If  IPIV(K)  <  0,  2  by  2
                   pivot, no interchange required.
    
         INFO      (output) INTEGER
                   = 0:  successful exit
                   < 0:  if INFO = -k, the k-th argument had an ille-
                   gal value
    
    
    
    


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