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dsytrs (3)
  • >> dsytrs (3) ( Solaris man: Библиотечные вызовы )
  • 
    NAME
         dsytrs - solve a system of linear equations A*X = B  with  a
         real symmetric matrix A using the factorization A = U*D*U**T
         or A = L*D*L**T computed by DSYTRF
    
    SYNOPSIS
         SUBROUTINE DSYTRS( UPLO, N, NRHS, A, LDA, IPIV, B, LDB, INFO
                   )
    
         CHARACTER UPLO
    
         INTEGER INFO, LDA, LDB, N, NRHS
    
         INTEGER IPIV( * )
    
         DOUBLE PRECISION A( LDA, * ), B( LDB, * )
    
    
    
         #include <sunperf.h>
    
         void dsytrs(char uplo, int n, int nrhs, double *da, int lda,
                   int *ipivot, double *db, int ldb, int *info) ;
    
    PURPOSE
         DSYTRS solves a system of linear equations A*X =  B  with  a
         real symmetric matrix A using the factorization A = U*D*U**T
         or A = L*D*L**T computed by DSYTRF.
    
    
    ARGUMENTS
         UPLO      (input) CHARACTER*1
                   Specifies whether the details of the factorization
                   are stored as an upper or lower triangular matrix.
                   = 'U':  Upper triangular, form is A = U*D*U**T;
                   = 'L':  Lower triangular, form is A = L*D*L**T.
    
         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.
    
         A         (input) DOUBLE PRECISION array, dimension (LDA,N)
                   The block diagonal matrix D  and  the  multipliers
                   used  to  obtain  the factor U or L as computed by
                   DSYTRF.
    
         LDA       (input) INTEGER
                   The leading dimension of  the  array  A.   LDA  >=
                   max(1,N).
    
         IPIV      (input) INTEGER array, dimension (N)
                   Details of the interchanges and the  block  struc-
                   ture of D as determined by DSYTRF.
    
         B         (input/output) DOUBLE PRECISION  array,  dimension
                   (LDB,NRHS)
                   On entry, the right hand side matrix B.  On  exit,
                   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
    
    
    
    


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