Robust Padé implementation and tests #3
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Add an implementation of the robust Padé approximation algorithm from Gonnet, Güttel, and Trefethen (SIAM Review 55, 1, 101-117, 2013). Also add module for evaluation of polynomials and rational functions, using Horner's method.
Add an example for the Padé module. It computes a [3/2] approximant to exp(x), which is compared to the actual value.
Add a test suite for poly_eval and rat_eval.
One for expontial and one for polynomial.
Remove U array in pade_init since it is not used. Resize arrays before function calls to avoid temporary array warnings.
Add a test case where the coefficients have random noise. Also make sure the polynomial test case is run for both real and complex types.
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Adds an implementation of the SVD-based robust Padé scheme from Gonnet, Güttel, and Trefethen (SIAM Review 55, 1, 101-117, 2013). Also adds variations of the test cases that are in the article.