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# scipy.interpolate.BSpline.__call__

`BSpline.``__call__`(x, nu=0, extrapolate=None)

  Evaluate a spline function.

  Parameters: | x : array_like points to evaluate the spline at. nu: int, optional derivative to evaluate (default is 0). extrapolate : bool, optional whether to extrapolate based on the first and last intervals or return nans. Default is self.extrapolate.
  Returns: | y : array_like Shape is determined by replacing the interpolation axis in the coefficient array with the shape of x.