chebyshev_series_test, a C code which calls chebyshev_series() to evaluate a Chebyshev series approximating a function f(x), while efficiently computing one, two or three derivatives of the series, which approximate f'(x), f''(x), and f'''(x).
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chebyshev_series, a C code which can evaluate a Chebyshev series approximating a function f(x), while efficiently computing one, two or three derivatives of the series, to approximate f'(x), f''(x), and f'''(x), by Manfred Zimmer.