WCfft1b WCfft1b2 WCfft1f WCfft1f2 WCost1b WCost1f WRfft1b WRfft1f WSint1b WSint1f

WSint1b() Function WSint1b ( N As  Long, R As  Variant  ) One-dimensional sine backward transform Purpose WSint1b computes the one-dimensional Fourier transform of an odd sequence within a real array. This is referred to as the backward transform or Fourier synthesis, transforming the sequence from spectral to physical space. R(j) = ΣR(k)sin(π(j+1)(k+1)/(N+1)) (Σ for k = 0 to N-1) (j = 0 to N-1) This transform is normalized since a call to WSint1b followed by a call to WSint1f (or vice-versa) reproduces the original array subject to algorithmic constraints, roundoff error, etc. Returns N x 1 Column 1 Rows 1 to N Sine backward transformed data sequence Parameters [in] N The length of the sequence to be transformed. (N >= 1) The transform is most efficient when N + 1 is a product of small primes. [in] R (N) The sequence to be transformed. Reference FFTPACK Example See example of WSint1f.