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zpptrs (3)
  • >> zpptrs (3) ( Solaris man: Библиотечные вызовы )
  • 
    NAME
         zpptrs - solve a system of linear equations A*X = B  with  a
         Hermitian positive definite matrix A in packed storage using
         the Cholesky factorization A = U**H*U or A = L*L**H computed
         by ZPPTRF
    
    SYNOPSIS
         SUBROUTINE ZPPTRS( UPLO, N, NRHS, AP, B, LDB, INFO )
    
         CHARACTER UPLO
    
         INTEGER INFO, LDB, N, NRHS
    
         COMPLEX*16 AP( * ), B( LDB, * )
    
    
    
         #include <sunperf.h>
    
         void zpptrs(char uplo, int n, int nrhs, doublecomplex  *zap,
                   doublecomplex *zb, int ldb, int *info) ;
    
    PURPOSE
         ZPPTRS solves a system of linear equations A*X =  B  with  a
         Hermitian positive definite matrix A in packed storage using
         the Cholesky factorization A = U**H*U or A = L*L**H computed
         by ZPPTRF.
    
    
    ARGUMENTS
         UPLO      (input) CHARACTER*1
                   = 'U':  Upper triangle of A is stored;
                   = 'L':  Lower triangle of A is stored.
    
         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) COMPLEX*16 array, dimension (N*(N+1)/2)
                   The triangular factor U or  L  from  the  Cholesky
                   factorization  A  =  U**H*U  or A = L*L**H, packed
                   columnwise in a linear array.  The j-th column  of
                   U  or  L is stored in the array AP as follows:  if
                   UPLO  =  'U',  AP(i  +  (j-1)*j/2)  =  U(i,j)  for
                   1<=i<=j;  if  UPLO = 'L', AP(i + (j-1)*(2n-j)/2) =
                   L(i,j) for j<=i<=n.
    
         B         (input/output)   COMPLEX*16    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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