pairdist.pp3(spatstat)
pairdist.pp3()所属R语言包:spatstat
Pairwise distances in Three Dimensions
成对三维空间中的距离
译者:生物统计家园网 机器人LoveR
描述----------Description----------
Computes the matrix of distances between all pairs of points in a three-dimensional point pattern.
计算所有对一个三维的点图案中的点之间的距离的矩阵。
用法----------Usage----------
## S3 method for class 'pp3'
pairdist(X, ..., periodic=FALSE, squared=FALSE)
参数----------Arguments----------
参数:X
A point pattern (object of class "pp3").
点模式(类的对象"pp3")。
参数:...
Ignored.
忽略。
参数:periodic
Logical. Specifies whether to apply a periodic edge correction.
逻辑。指定是否申请一个周期的边缘校正。
参数:squared
Logical. If squared=TRUE, the squared distances are returned instead (this computation is faster).
逻辑。如果squared=TRUE,距离的平方返回,而不是(此计算速度更快)。
Details
详细信息----------Details----------
This is a method for the generic function pairdist.
这是一个方法的通用函数pairdist。
Given a three-dimensional point pattern X (an object of class "pp3"), this function computes the Euclidean distances between all pairs of points in X, and returns the matrix of distances.
给定一个三维点模式X(一个类的对象"pp3"),这个函数计算所有点对之间的欧氏距离在X,并返回的距离矩阵。
Alternatively if periodic=TRUE and the window containing X is a box, then the distances will be computed in the "periodic" sense (also known as "torus" distance): opposite faces of the box are regarded as equivalent. This is meaningless if the window is not a box.
或者,如果periodic=TRUE和窗口,该窗口包含X是一个方块,然后将计算的距离在定期感(也被称为“圆环”距离):的框中的相对面是视为等同。这是无意义的,如果该窗口不在一个盒子。
If squared=TRUE then the squared Euclidean distances d^2 are returned, instead of the Euclidean distances d. The squared distances are faster to calculate, and are sufficient for many purposes (such as finding the nearest neighbour of a point).
如果squared=TRUE然后的平方欧氏距离d^2返回,而不是的欧几里德距离d。距离的平方速度来计算,足够用于多种用途(如寻找最近的邻居的一个点)。
值----------Value----------
A square matrix whose [i,j] entry is the distance between the points numbered i and j.
一方阵的[i,j]项是点之间的距离编号i和j。
(作者)----------Author(s)----------
Adrian Baddeley
<a href="mailto:Adrian.Baddeley@csiro.au">Adrian.Baddeley@csiro.au</a>
<a href="http://www.maths.uwa.edu.au/~adrian/">http://www.maths.uwa.edu.au/~adrian/</a>
based on two-dimensional code by
Pavel Grabarnik.
参见----------See Also----------
pairdist, crossdist, nndist, K3est
pairdist,crossdist,nndist,K3est
实例----------Examples----------
X <- runifpoint3(20)
d <- pairdist(X)
d <- pairdist(X, periodic=TRUE)
d <- pairdist(X, squared=TRUE)
转载请注明:出自 生物统计家园网(http://www.biostatistic.net)。
注:
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