numpy.polynomial.polynomial.polysub#

polynomial.polynomial.polysub(c1, c2)[source] #

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, c2array_like

1-D arrays of polynomial coefficients ordered from low to high.

Returns:

outndarray

Of coefficients representing their difference.

See also

polyadd, polymulx, polymul, polydiv, polypow

Examples

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>>> fromnumpy.polynomialimport 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.])

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