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# numpy.polynomial.polynomial.polysub

`numpy.polynomial.polynomial.``polysub`(c1, c2)

  Subtract one polynomial from another.

  Returns the difference of two polynomials c1 - c2. The arguments are sequences of coefficients from lowest order term to highest, i.e., [1,2,3] represents the polynomial `1 + 2*x + 3*x**2`.

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

  See also

  `polyadd`, `polymul`, `polydiv`, `polypow`

  Examples

      >>> from numpy import polynomial as P
      >>> c1 = (1,2,3)
      >>> c2 = (3,2,1)
      >>> P.polysub(c1,c2)
      array([-2.,  0.,  2.])
      >>> P.polysub(c2,c1) # -P.polysub(c1,c2)
      array([ 2.,  0., -2.])