In an application program, before calling B or F routines for the first time, or before calling them with aĭifferent length, users must initialize an array by calling the I routine of the appropriate pair or triplet. The suffix I denotes initialize, F denotes forward (as in forward transform) and B denotes backward. All of the FFTPACK 5.1 routines listed above are grouped Library FFTPACK 5.1 contains 1D, 2D, and multiple fast Fourier subroutines, written in Fortran 77, for transforming real and complexĭata, real even and odd wave data, and real even and odd quarter-wave data. SINQMF multiple real quarter-sine forward SINQMB multiple real quarter-sine backward SINQMI multiple real quarter-sine initialization SINQ1I 1D real quarter-sine initialization FFTPACK 5.1 - a FORTRAN library of fast Fourier transformsĬOSTMI multiple real cosine initializationĬOSQ1I 1D real quarter-cosine initializationĬOSQMI multiple real quarter-cosine initializationĬOSQMB multiple real quarter-cosine backwardĬOSQMF multiple real quarter-cosine forward
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