numpy.polynomial.laguerre.lagtrim¶
-
numpy.polynomial.laguerre.
lagtrim
(c, tol=0)[source]¶ 从多项式中删除“小”“拖尾”系数。
“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.”参数: c:array_like
1-d数组的系数,从最低到最高排序。
tol:number,可选
移除绝对值小于或等于to1(默认值为零)的尾随(即,最高阶)元素。
返回: 修剪:ndarray
删除尾随零的1-d数组。如果结果序列为空,则返回包含单个零的序列。
上升: ValueError
如果tol
也可以看看
trimseq
例子
>>> 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])