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# scipy.interpolate.PPoly.extend

PPoly.extend(c, x)

  Add additional breakpoints and coefficients to the polynomial.

  Parameters:
    c ndarray, size (k, m, …)

      Additional coefficients for polynomials in intervals. Note that the first additional interval will be formed using one of the `self.x` end points.

    x ndarray, size (m,)

      Additional breakpoints. Must be sorted in the same order as `self.x` and either to the right or to the left of the current breakpoints.