First and Second Derivatives of a Periodic Function Using Discrete Fourier Transforms
Initializing live version
Requires a Wolfram Notebook System
Interact on desktop, mobile and cloud with the free Wolfram Player or other Wolfram Language products.
Consider the family of periodic functions , where . This Demonstration applies the discrete Fourier transform to compute the first and second derivatives of . (The derivative order 0 gives the original function.) The derivatives obtained analytically are shown in dashed red, while the numerical solutions are shown in blue. For a large number of sample points, there is close agreement between the two methods.
Contributed by: Housam Binous, Ahmed Bellagi, and Brian G. Higgins (September 2015)
Open content licensed under CC BY-NC-SA