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zspsl (3)
  • >> zspsl (3) ( Solaris man: Библиотечные вызовы )
  • 
    NAME
         zspsl - solve the linear system  Ax  =  b  for  a  symmetric
         matrix  A  in packed storage, which has been UDU-factored by
         xSPCO or xSPFA, and vectors b and x.
    
    SYNOPSIS
         SUBROUTINE DSPSL (DA, N, IPIVOT, DB)
    
         SUBROUTINE SSPSL (SA, N, IPIVOT, SB)
    
         SUBROUTINE ZSPSL (ZA, N, IPIVOT, ZB)
    
         SUBROUTINE CSPSL (CA, N, IPIVOT, CB)
    
    
    
         #include <sunperf.h>
    
         void dspsl(double *dap, int n, int *kpvt, double *b) ;
    
         void sspsl(float *sap, int n, int *kpvt, float *b) ;
    
         void zspsl(doublecomplex *zap, int n, int *kpvt,  doublecom-
                   plex *b) ;
    
         void cspsl(complex *cap, int n, int *kpvt, complex *b) ;
    
    ARGUMENTS
         xA        UDU factorization of the matrix A, as computed  by
                   xSPCO or xSPFA.
    
         N         Order of the matrix A.  N >= 0.
    
         IPIVOT    Pivot vector as computed by xSPCO or xSPFA.
    
         xB        On entry, the right-hand side vector b.  On  exit,
                   the solution vector x.
    
    SAMPLE PROGRAM
               PROGRAM TEST
               IMPLICIT NONE
         C
               INTEGER           LENGTA, N
               PARAMETER        (N = 3)
               PARAMETER        (LENGTA = (N * N + N) / 2)
         C
               DOUBLE PRECISION  A(LENGTA), B(N), RCOND, WORK(N)
               INTEGER           IPIVOT(N)
         C
               EXTERNAL          DSPCO, DSPSL
         C
         C     Initialize the array A to store in packed symmetric format
         C     the matrix A shown below.  Initialize the array B to store
         C     the vector b shown below.
         C
         C         1  0  4        15
         C     A = 0  2  0    b = 12
         C         4  0  1        15
         C
               DATA A / 1.0D0, 0.0D0, 2.0D0, 4.0D0, 0.0D0, 1.0D0 /
               DATA B / 1.5D1, 1.2D1, 1.5D1 /
         C
               PRINT 1000
               PRINT 1010, A(1), A(2), A(4)
               PRINT 1010, A(2), A(3), A(5)
               PRINT 1010, A(4), A(5), A(6)
               PRINT 1020
               PRINT 1030, B
               CALL DSPCO (A, N, IPIVOT, RCOND, WORK)
               IF ((RCOND + 1.0D0) .EQ. RCOND) THEN
                 PRINT 1040
               END IF
               CALL DSPSL (A, N, IPIVOT, B)
               PRINT 1050
               PRINT 1030, B
         C
          1000 FORMAT (1X, 'A:')
          1010 FORMAT (3(3X, F4.1))
          1020 FORMAT (/1X, 'b:')
          1030 FORMAT (3X, F4.1)
          1040 FORMAT (1X, 'A may be singular to working precision.')
          1050 FORMAT (/1X, 'A**(-1) * b:')
         C
               END
    
    SAMPLE OUTPUT
          A:
             1.0    0.0    4.0
             0.0    2.0    0.0
             4.0    0.0    1.0
    
          b:
            15.0
            12.0
            15.0
    
          A**(-1) * b:
             3.0
             6.0
             3.0
    
    
    
    


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