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Tessero\Interpolate\LSQUnivariateSpline

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__construct 
__construct(array $x, array $y, array $t, int $k = 3)
query 
query(array $xnew): array

Evaluate the least-squares spline at the query point(s).

knots 
knots(): array

The full (clamped) knot vector used for the fit; mirrors sp.get_knots() augmented ends.