* C06FPF Example Program Text * Mark 14 Revised. NAG Copyright 1989. * .. Parameters .. INTEGER MMAX, NMAX PARAMETER (MMAX=5,NMAX=20) INTEGER NIN, NOUT PARAMETER (NIN=5,NOUT=6) * .. Local Scalars .. INTEGER I, IFAIL, J, M, N * .. Local Arrays .. DOUBLE PRECISION TRIG(2*NMAX), U(NMAX*MMAX), V(NMAX*MMAX), + WORK(2*MMAX*NMAX), X(NMAX*MMAX) * .. External Subroutines .. EXTERNAL C06FPF, C06FQF, C06GQF, C06GSF * .. Executable Statements .. WRITE (NOUT,*) 'C06FPF Example Program Results' * Skip heading in data file READ (NIN,*) 20 READ (NIN,*,END=140) M, N IF (M.LE.MMAX .AND. N.LE.NMAX) THEN DO 40 J = 1, M READ (NIN,*) (X(I*M+J),I=0,N-1) 40 CONTINUE WRITE (NOUT,*) WRITE (NOUT,*) 'Original data values' WRITE (NOUT,*) DO 60 J = 1, M WRITE (NOUT,99999) ' ', (X(I*M+J),I=0,N-1) 60 CONTINUE IFAIL = 0 * CALL C06FPF(M,N,X,'Initial',TRIG,WORK,IFAIL) * WRITE (NOUT,*) WRITE (NOUT,*) + 'Discrete Fourier transforms in Hermitian format' WRITE (NOUT,*) DO 80 J = 1, M WRITE (NOUT,99999) ' ', (X(I*M+J),I=0,N-1) 80 CONTINUE WRITE (NOUT,*) WRITE (NOUT,*) 'Fourier transforms in full complex form' * CALL C06GSF(M,N,X,U,V,IFAIL) * DO 100 J = 1, M WRITE (NOUT,*) WRITE (NOUT,99999) 'Real ', (U(I*M+J),I=0,N-1) WRITE (NOUT,99999) 'Imag ', (V(I*M+J),I=0,N-1) 100 CONTINUE * CALL C06GQF(M,N,X,IFAIL) CALL C06FQF(M,N,X,'Subsequent',TRIG,WORK,IFAIL) * WRITE (NOUT,*) WRITE (NOUT,*) 'Original data as restored by inverse transform' WRITE (NOUT,*) DO 120 J = 1, M WRITE (NOUT,99999) ' ', (X(I*M+J),I=0,N-1) 120 CONTINUE GO TO 20 ELSE WRITE (NOUT,*) 'Invalid value of M or N' END IF 140 STOP * 99999 FORMAT (1X,A,6F10.4) END