FFTW is a free collection of fast C routines for computing the Discrete Fourier Transform in one or more dimensions. It includes complex, real, symmetric, and parallel transforms, and can handle arbitrary array sizes efficiently. FFTW is typical

A Monte Carlo model of steady-state light transport in multi-layered tissue (mcml) and the corresponding convolution program (conv) have been coded in ANSI Standard C. The programs can therefore be executed on a variety of computers. Dynamic data