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dtptrs (3)
  • >> dtptrs (3) ( Solaris man: Библиотечные вызовы )
  • 
    NAME
         dtptrs - solve a triangular system of the form   A * X  =  B
         or A**T * X = B,
    
    SYNOPSIS
         SUBROUTINE DTPTRS( UPLO, TRANS, DIAG, N, NRHS, AP,  B,  LDB,
                   INFO )
    
         CHARACTER DIAG, TRANS, UPLO
    
         INTEGER INFO, LDB, N, NRHS
    
         DOUBLE PRECISION AP( * ), B( LDB, * )
    
    
    
         #include <sunperf.h>
    
         void dtptrs(char uplo, char trans, char  diag,  int  n,  int
                   nrhs, double *dap, double *db, int ldb, int *info)
                   ;
    
    PURPOSE
         DTPTRS solves a triangular system of the form
    
         where A is a triangular matrix of order N stored  in  packed
         format,  and  B  is an N-by-NRHS matrix.  A check is made to
         verify that A is nonsingular.
    
    
    ARGUMENTS
         UPLO      (input) CHARACTER*1
                   = 'U':  A is upper triangular;
                   = 'L':  A is lower triangular.
    
         TRANS     (input) CHARACTER*1
                   Specifies the form of the system of equations:
                   = 'N':  A * X = B  (No transpose)
                   = 'T':  A**T * X = B  (Transpose)
                   = 'C':  A**H * X = B  (Conjugate transpose = Tran-
                   spose)
    
         DIAG      (input) CHARACTER*1
                   = 'N':  A is non-unit triangular;
                   = 'U':  A is unit triangular.
    
         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.
    
         AP        (input)   DOUBLE   PRECISION   array,    dimension
                   (N*(N+1)/2)
                   The upper or lower  triangular  matrix  A,  packed
                   columnwise  in a linear array.  The j-th column of
                   A is stored in the array AP as follows:  if UPLO =
                   'U',  AP(i  +  (j-1)*j/2) = A(i,j) for 1<=i<=j; if
                   UPLO = 'L', AP(i + (j-1)*(2*n-j)/2) =  A(i,j)  for
                   j<=i<=n.
    
         B         (input/output) DOUBLE PRECISION  array,  dimension
                   (LDB,NRHS)
                   On entry, the right hand side matrix B.  On  exit,
                   if INFO = 0, the solution matrix X.
    
         LDB       (input) INTEGER
                   The leading dimension of  the  array  B.   LDB  >=
                   max(1,N).
    
         INFO      (output) INTEGER
                   = 0:  successful exit
                   < 0:  if INFO = -i, the i-th argument had an ille-
                   gal value
                   > 0:  if INFO = i, the i-th diagonal element of  A
                   is  zero,  indicating  that the matrix is singular
                   and the solutions X have not been computed.
    
    
    
    


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