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Fast Fourier transform: Difference between revisions
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MaiconSoft (talk | contribs) (Added Delphi example) |
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Line 708:
even = fft(Array.new(x.size // 2) { |k| x[2 * k] })
odd = fft(Array.new(x.size // 2) { |k| x[2 * k + 1] })
c = Array.new(x.size // 2) { |k| Math.exp((-2 * Math::PI * k / x.size).i
codd = Array.new(x.size // 2) { |k| c[k] * odd[k] }
return Array.new(x.size // 2) { |k| even[k] + codd[k] } + Array.new(x.size // 2) { |k| even[k] - codd[k] }
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