Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsNumerical Approximation of the Fourier Transform by the Fast Fourier Transform (FFT) Algorithmhttp://demonstrations.wolfram.com/NumericalApproximationOfTheFourierTransformByTheFastFourierT/]]>http://demonstrations.wolfram.com/NumericalApproximationOfTheFourierTransformByTheFastFourierT/Multipoint Padé Approximantshttp://demonstrations.wolfram.com/MultipointPadeApproximants/]]>http://demonstrations.wolfram.com/MultipointPadeApproximants/