
PROGRAM TEST

IMPLICIT NONE

C

INTEGER N

PARAMETER (N = 9)

C

INTEGER I

REAL A(N), B(N), AZERO, PI, R(N)

REAL WSAVE(3 * N + 15)

C

EXTERNAL EZFFTB, EZFFTF, EZFFTI

INTRINSIC ACOS, COS, SIN

C

C Initialize array to a sequence of real numbers.

C

PI = ACOS (1.0)

DO 100, I=1, N

R(I) = 3.0 + SIN ((I  1.0) * 2.0 * PI / N) +

$ 4.0 * COS ((I  1.0) * 8.0 * PI / N)

100 CONTINUE

C

CALL EZFFTI (N, WSAVE)

PRINT 1000

PRINT 1010, (R(I), I = 1, N)

CALL EZFFTF (N, R, AZERO, A, B, WSAVE)

PRINT 1020, AZERO

PRINT 1030

PRINT 1010, (A(I), I = 1, N)

PRINT 1040

PRINT 1010, (B(I), I = 1, N)

CALL EZFFTB (N, R, AZERO, A, B, WSAVE)

PRINT 1050

PRINT 1010, (R(I), I = 1, N)

C

1000 FORMAT (1X, 'Original Sequence: ')

1010 FORMAT (100(F6.1, 1X))

1020 FORMAT (1X, 'Azero = ' F4.1)

1030 FORMAT (1X, 'A = ')

1040 FORMAT (1X, 'B = ')

1050 FORMAT (1X, 'Recovered Sequence: ')

C

END

