trimcoef(c, tol=0)
"Small" means "small in absolute value" and is controlled by the parameter :None:None:`tol`; "trailing" means highest order coefficient(s), e.g., in [0, 1, 1, 0, 0]
(which represents 0 + x + x**2 + 0*x**3 + 0*x**4
) both the 3-rd and 4-th order coefficients would be "trimmed."
1-d array of coefficients, ordered from lowest order to highest.
Trailing (i.e., highest order) elements with absolute value less than or equal to :None:None:`tol` (default value is zero) are removed.
If :None:None:`tol` < 0
1-d array with trailing zeros removed. If the resulting series would be empty, a series containing a single zero is returned.
Remove "small" "trailing" coefficients from a polynomial.
>>> from numpy.polynomial import polyutils as pu
... pu.trimcoef((0,0,3,0,5,0,0)) array([0., 0., 3., 0., 5.])
>>> pu.trimcoef((0,0,1e-3,0,1e-5,0,0),1e-3) # item == tol is trimmed array([0.])
>>> i = complex(0,1) # works for complexSee :
... pu.trimcoef((3e-4,1e-3*(1-i),5e-4,2e-5*(1+i)), 1e-3) array([0.0003+0.j , 0.001 -0.001j])
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