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How do they sell the non-GPL version? Just replace the GPL libraries like FFTW with inferior replacements like FFTPACK?

• _delirium 9y ago
  The non-GPL version uses Intel's proprietary Math Kernel Library (MKL) for FFTs, linear algebra, etc.
  • jordigh 9y ago
    Huh, so did MKL just reimplement FFTW? I see that they have an interface for it. Or maybe they bought a GPL exception to FFTW.
    • ihnorton 9y ago
      They expose an FFTW-compatible API, but as far as I know it's an independent implementation.
      • deleted 9y ago
        [deleted]