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Интерактивная система просмотра системных руководств (man-ов)

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dcosti (3)
  • >> dcosti (3) ( Solaris man: Библиотечные вызовы )
  • 
    NAME
         dcosti - initialize the  array  xWSAVE,  which  is  used  in
         xCOST.
    
    SYNOPSIS
         SUBROUTINE COSTI (N, RWSAVE)
    
         SUBROUTINE DCOSTI (N, DWSAVE)
    
         SUBROUTINE VCOSTI (N, RWSAVE)
    
         SUBROUTINE VDCOSTI (N, DWSAVE)
    
    
    
         #include <sunperf.h>
    
         void costi (int n, float *rwsave) ;
    
         void dcosti (int n, double *dwsave) ;
    
         void vcosti (int n, float *rwsave) ;
    
         void vdcosti (int n, float *dwsave) ;
    
    ARGUMENTS
         N         Length of the sequence  to  be  transformed.   The
                   method  is  most efficient when N - 1 is a product
                   of small primes.  N >= 2.
    
         xWSAVE    On entry, an array with a dimension of at least (3
                   *  N  + 15).  Different xWSAVE arrays are required
                   for different values of  N.   This  initialization
                   does  not  have  to  be  repeated between calls to
                   xCOST as long as N and  xWSAVE  remain  unchanged,
                   thus  subsequent transforms can be obtained faster
                   than the first.
    
    SAMPLE PROGRAM
               PROGRAM TEST
               IMPLICIT NONE
         C
               INTEGER         N
               PARAMETER      (N = 9)
         C
               INTEGER         I
               REAL            PI, X(N), WSAVE(3 * N + 15)
         C
               EXTERNAL        COST, COSTI
               INTRINSIC       ACOS, COS
         C
         C     Initialize the array X to an even sequence, that is, it can be
         C     expanded in terms of a trigonometric series that contains only
         C     cosine terms.
         C
               PI = ACOS (-1.0)
               DO 100, I=1, N
                 X(I) = COS ((I - 1.0) * 2.0 * PI / (N - 1.0))
           100 CONTINUE
         C
               CALL COSTI (N, WSAVE)
               PRINT 1000
               PRINT 1010, (X(I), I = 1, N)
               CALL COST (N, X, WSAVE)
               PRINT 1020
               PRINT 1010, (X(I), I = 1, N)
               CALL COST (N, X, WSAVE)
               PRINT 1030
               PRINT 1010, (X(I), I = 1, N)
         C
          1000 FORMAT (1X, 'Original Sequence: ')
          1010 FORMAT (1X, 100(F5.1, 1X))
          1020 FORMAT (1X, 'Transformed Sequence: ')
          1030 FORMAT (1X, 'Recovered Sequence: ')
               END
    
    SAMPLE OUTPUT
          Original Sequence:
            1.0   0.7   0.0  -0.7  -1.0  -0.7   0.0   0.7   1.0
          Transformed Sequence:
            0.0   0.0   8.0   0.0   0.0   0.0   0.0   0.0   0.0
          Recovered Sequence:
           16.0  11.3   0.0 -11.3 -16.0 -11.3   0.0  11.3  16.0
    
    
    
    


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