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# numpy.polynomial.laguerre.lagsub

`numpy.polynomial.laguerre.``lagsub`(c1, c2)

  Subtract one Laguerre series from another.

  Returns the difference of two Laguerre series c1 - c2. The sequences of coefficients are from lowest order term to highest, i.e., [1,2,3] represents the series `P_0 + 2*P_1 + 3*P_2`.

  Parameters : | c1, c2 : array_like 1-D arrays of Laguerre series coefficients ordered from low to high.
  Returns : | out : ndarray Of Laguerre series coefficients representing their difference.

  See also

  `lagadd`, `lagmul`, `lagdiv`, `lagpow`

  Notes

  Unlike multiplication, division, etc., the difference of two Laguerre series is a Laguerre series (without having to “reproject” the result onto the basis set) so subtraction, just like that of “standard” polynomials, is simply “component-wise.”

  Examples

      >>> from numpy.polynomial.laguerre import lagsub
      >>> lagsub([1, 2, 3, 4], [1, 2, 3])
      array([ 0.,  0.,  0.,  4.])