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numpy.polynomial.legendre.legtrim(c, tol=0)
[source] -
Remove ?small? ?trailing? coefficients from a polynomial.
?Small? means ?small in absolute value? and is controlled by the parameter
tol
; ?trailing? means highest order coefficient(s), e.g., in[0, 1, 1, 0, 0]
(which represents0 + x + x**2 + 0*x**3 + 0*x**4
) both the 3-rd and 4-th order coefficients would be ?trimmed.?Parameters: c : array_like
1-d array of coefficients, ordered from lowest order to highest.
tol : number, optional
Trailing (i.e., highest order) elements with absolute value less than or equal to
tol
(default value is zero) are removed.Returns: trimmed : ndarray
1-d array with trailing zeros removed. If the resulting series would be empty, a series containing a single zero is returned.
Raises: ValueError
If
tol
< 0See also
trimseq
Examples
>>> from numpy import polynomial as P >>> P.trimcoef((0,0,3,0,5,0,0)) array([ 0., 0., 3., 0., 5.]) >>> P.trimcoef((0,0,1e-3,0,1e-5,0,0),1e-3) # item == tol is trimmed array([ 0.]) >>> i = complex(0,1) # works for complex >>> P.trimcoef((3e-4,1e-3*(1-i),5e-4,2e-5*(1+i)), 1e-3) array([ 0.0003+0.j , 0.0010-0.001j])
numpy.polynomial.legendre.legtrim()
2017-01-10 18:17:36
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