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cosqb (3)
  • >> cosqb (3) ( Solaris man: Библиотечные вызовы )
  • 
    NAME
         cosqb - synthesize a Fourier sequence from  its  representa-
         tion in terms of a cosine series with odd wave numbers.  The
         xCOSQ operations are unnormalized inverses of themselves, so
         a  call to xCOSQF followed by a call to xCOSQB will multiply
         the input sequence by 4 * N.  The VxCOSQ operations are nor-
         malized,  so a call of VxCOSQF followed by a call of VxCOSQB
         will return the original sequence.
    
    SYNOPSIS
         SUBROUTINE COSQB (N, RX, RWSAVE)
    
         SUBROUTINE DCOSQB (N, DX, DWSAVE)
    
         SUBROUTINE VCOSQB (M, N, RX, RXT, MDIMX, RWSAVE)
    
         SUBROUTINE VDCOSQB (M, N, DX, DXT, MDIMX, DWSAVE)
    
    
    
         #include <sunperf.h>
    
         void cosqb (int n, float *sx, float *wsave) ;
    
         void dcosqb (int n, double *dx, double *wsave) ;
    
         void vcosqb(int m,  int  n,  float  *sx,  int  mdimx,  float
                   *wsave)
    
         void vdcosqb(int m, int n, double  *dx,  int  mdimx,  double
                   *wsave)
    
    ARGUMENTS
         M         (For vector operations only.)
                   The number of sequences to be transformed.   M  >=
                   0.
    
         N         Length of the sequence to be  transformed.   These
                   subroutines are most efficient when N is a product
                   of small primes.  N >= 0.
    
         xX        On entry, an array  of  length  N  containing  the
                   sequence  to  be transformed.  For VxCOSQB, a real
                   two-dimensional array with dimensions of (MDIMX  x
                   N)   whose   rows  contain  the  sequences  to  be
                   transformed.  On  exit,  the  quarter-wave  cosine
                   synthesis of the input.
    
         xXT       (For vector operations only.)
                   A real two-dimensional work array with  dimensions
                   of (MDIMX x N).
    
         MDIMX     (For vector operations only.)
                   Leading dimension of the  arrays  xX  and  xXT  as
                   specified  in a dimension or type statement. MDIMX
                   >= M.
    
         xWSAVE    On entry, an array with dimension of at least (3 *
                   N + 15) for scalar subroutines or (2 * N + 15) for
                   vector  subroutines,  initialized  by  xCOSQI   or
                   VxCOSQI.
    
    SAMPLE PROGRAM
               PROGRAM TEST
               IMPLICIT NONE
         C
               INTEGER          M, N
               PARAMETER       (M = 1)
               PARAMETER       (N = 6)
         C
               INTEGER          I
               REAL             PI,  WSAVE(N + 15), X(M, N), XT(M, N)
         C
               EXTERNAL         VCOSQB, VCOSQF, VCOSQI
               INTRINSIC        ACOS, COS
         C
         C     Initialize the first row of the  array to a real even
         C     quarter-wave sequence, that is, it can be expanded in
         C     terms of a cosine series with only only odd wave numbers.
         C
               PI = ACOS (-1.0)
               DO 100, I=1, N
                 X(M,I) = 40.0 * COS ((I - 1) * PI / (2.0 * N))
           100 CONTINUE
         C
               PRINT 1000
               PRINT 1010, (X(M, I), I = 1, N)
               CALL VCOSQI (N, WSAVE)
               CALL VCOSQF (M, N, X, XT, M, WSAVE)
               PRINT 1020
               PRINT 1010, (X(M, I), I = 1, N)
               CALL VCOSQB (M, N, X, XT, M, WSAVE)
               PRINT 1030
               PRINT 1010, (X(M, 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: ')
         C
               END
    
    SAMPLE OUTPUT
          Original Sequence:
           40.0  38.6  34.6  28.3  20.0  10.4
          Transformed Sequence:
           49.0   0.0   0.0   0.0   0.0   0.0
          Recovered Sequence:
           40.0  38.6  34.6  28.3  20.0  10.4
    
    
    
    


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