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# numpy.polynomial.chebyshev.chebdiv

`numpy.polynomial.chebyshev.``chebdiv`(c1, c2)

  Divide one Chebyshev series by another.

  Returns the quotient-with-remainder of two Chebyshev series c1 / c2. The arguments are sequences of coefficients from lowest order “term” to highest, e.g., [1,2,3] represents the series `T_0 + 2*T_1 + 3*T_2`.

  Parameters : | c1, c2 : array_like 1-D arrays of Chebyshev series coefficients ordered from low to high.
  Returns : | [quo, rem] : ndarrays Of Chebyshev series coefficients representing the quotient and remainder.

  See also

  `chebadd`, `chebsub`, `chebmul`, `chebpow`

  Notes

  In general, the (polynomial) division of one C-series by another results in quotient and remainder terms that are not in the Chebyshev polynomial basis set. Thus, to express these results as C-series, it is typically necessary to “reproject” the results onto said basis set, which typically produces “unintuitive” (but correct) results; see Examples section below.

  Examples

      >>> from numpy.polynomial import chebyshev as C
      >>> c1 = (1,2,3)
      >>> c2 = (3,2,1)
      >>> C.chebdiv(c1,c2) # quotient "intuitive," remainder not
      (array([ 3.]), array([-8., -4.]))
      >>> c2 = (0,1,2,3)
      >>> C.chebdiv(c2,c1) # neither "intuitive"
      (array([ 0.,  2.]), array([-2., -4.]))