interp_spline_test, an Octave code which calls interp_spline(), which interactively computes a cubic spline (NCS) interpolant to a function f(x) at n equally spaced points in the interval [a,b], using the "not-a-knot" condition at the endpoints.
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interp_spline, an Octave code which interactively computes a cubic spline (NCS) interpolant to a function f(x) at n equally spaced points in the interval [a,b], using the "not-a-knot" condition at the endpoints.