backSpline(splines)
backSpline()所属R语言包:splines
Monotone Inverse Spline
单调逆样条
译者:生物统计家园网 机器人LoveR
描述----------Description----------
Create a monotone inverse of a monotone natural spline.
创建一个单调的单调的自然样条逆。
用法----------Usage----------
backSpline(object)
参数----------Arguments----------
参数:object
an object that inherits from class nbSpline or npolySpline. That is, the object must represent a natural interpolation spline but it can be either in the B-spline representation or the piecewise polynomial one. The spline is checked to see if it represents a monotone function.
一个对象类nbSpline或npolySpline继承。也就是说,该对象必须代表一个自然的插值样条,但它可以是在B样条表示或分段多项式一。样条线进行检查,看它是否代表了单调函数。
值----------Value----------
An object of class polySpline that contains the piecewise polynomial representation of a function that has the appropriate values and derivatives at the knot positions to be an inverse of the spline represented by object. Technically this object is not a spline because the second derivative is not constrained to be continuous at the knot positions. However, it is often a much better approximation to the inverse than fitting an interpolation spline to the y/x pairs.
一个对象类polySpline这包含适当的值,在结位置的衍生工具是逆样条代表object的一个函数,分段多项式表示。技术上,这个对象是不是因为二阶导数不限制在结头寸连续样条。然而,它往往是一个更好的近似比插值样条拟合的双Y / X逆。
作者(S)----------Author(s)----------
Douglas Bates and Bill Venables
参见----------See Also----------
interpSpline
interpSpline
举例----------Examples----------
require(graphics)
ispl <- interpSpline( women$height, women$weight )
bspl <- backSpline( ispl )
plot( bspl ) # plots over the range of the knots[图多海里的范围]
points( women$weight, women$height )
转载请注明:出自 生物统计家园网(http://www.biostatistic.net)。
注:
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