Edit File: splineNatural.js
import { interpolatorSplineBasisClosed, interpolatorSplineBasis } from './splineBasis.js'; const solve = v => { let i; let n = v.length - 1; let c = new Array(n); let _v = new Array(n); let sol = new Array(n); c[1] = 1 / 4; _v[1] = (6 * v[1] - v[0]) / 4; for (i = 2; i < n; ++i) { c[i] = 1 / (4 - c[i - 1]); _v[i] = (6 * v[i] - (i == n - 1 ? v[n] : 0) - _v[i - 1]) * c[i]; } sol[0] = v[0]; sol[n] = v[n]; if (n - 1 > 0) { sol[n - 1] = _v[n - 1]; } for (i = n - 2; i > 0; --i) { sol[i] = _v[i] - c[i] * sol[i + 1]; } return sol; }; export const interpolatorSplineNatural = arr => interpolatorSplineBasis(solve(arr)); export const interpolatorSplineNaturalClosed = arr => interpolatorSplineBasisClosed(solve(arr));
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