__call__(self, x, nu=0, extrapolate=None)
points to evaluate the spline at.
derivative to evaluate (default is 0).
whether to extrapolate based on the first and last intervals or return nans. If 'periodic', periodic extrapolation is used. Default is :None:None:`self.extrapolate`.
Shape is determined by replacing the interpolation axis in the coefficient array with the shape of x.
Evaluate a spline function.
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