partition.tiles(sperrorest)
partition.tiles()所属R语言包：sperrorest
Partition the study area into rectangular tiles
分区研究区域划分为矩形砖
译者：生物统计家园网 机器人LoveR
描述----------Description----------
partition.tiles divides the study area into a specified number of rectangular tiles. Optionally small partitions can be merged with adjacent tiles to achieve a minimum number or percentage of samples in each tile.
partition.tiles将研究区域划分为指定数量的长方形砖。可以选择小分区可以合并相邻的瓷砖，以达到每瓦的最低数量或比例的样本。
用法----------Usage----------
partition.tiles(data, coords = c("x", "y"),
dsplit = NULL, nsplit = NULL,
rotation = c("none", "random", "user"), user.rotation,
offset = c("none", "random", "user"), user.offset,
reassign = TRUE, min.frac = 0.025, min.n = 5,
iterate = 1, return.factor = FALSE, repetition = 1,
seed1 = NULL)
参数----------Arguments----------
参数：coords
vector of length 2 defining the variables in data that contain the x and y coordinates of sample locations
向量，长度为2data包含的x和y坐标的样本的位置定义的变量在
参数：dsplit
optional vector of length 2: equidistance of splits in (possibly rotated) x direction (dsplit[1]) and y direction (dsplit[2]) used to define tiles. If dsplit is of length 1, its value is recycled. Either dsplit or nsplit must be specified.
可选的向量长度为2：等距离的分割（可能旋转）x方向（dsplit[1]）和y方向（dsplit[2]）用来定义瓷砖。如果dsplit是长度为1，其值被回收。无论是dsplit或nsplit必须指定。
参数：nsplit
optional vector of length 2: number of splits in (possibly rotated) x direction (nsplit[1]) and y direction (nsplit[2]) used to define tiles. If nsplit is of length 1, its value is recycled.
可选的向量长度为2：分割数（可能旋转）x方向（nsplit[1]）和y方向（nsplit[2]）用来定义瓷砖。如果nsplit是长度为1，其值被回收。
参数：rotation
indicates whether and how the rectangular grid should be rotated; random rotation is only between -45 and +45 degrees
是否以及如何表示的矩形网格应该是旋转; -45和+45度之间随意旋转
参数：user.rotation
if rotation="user", angles (in degrees) by which the rectangular grid is to be rotated in each repetition. Either a vector of same length as repetition, or a single number that will be replicated length(repetition) times.
如果rotation="user"，角度（单位：度），由该矩形网格是在每个重复旋转。无论是相同的长度的矢量作为repetition，或一个单一的数字将被复制length(repetition)倍。
参数：offset
indicates whether and how the rectangular grid should be shifted by an offset
是否以及如何表示的矩形网格应转向的偏移
参数：user.offset
if offset="user", a list (or vector) of two components specifying a shift of the rectangular grid in (possibly rotated) x and y direction. The offset values are relative values, a value of 0.5 resulting in a one-half tile shift towards the left, or upward. If this is a list, its first (second) component refers to the rotated x (y) direction, and both components must have same length as repetition (or length 1). If a vector of length 2 (or list components have length 1), the two values will be interpreted as relative shifts in (rotated) x and y direction, respectively, and will therefore be recycled as needed (length(repetition) times each).
如果offset="user"，指定的移位（可能是旋转）的矩形网格，在x和y方向的两个分量的一个列表（或向量）。的偏移量的值是相对值，一个值0.5导致在一个半瓷砖转向左侧，或向上。如果这是一个列表，它的第一（第二）的成分是指旋转的×（y）方向，这两个组件repetition（或长度1）必须具有相同的长度。如果一个矢量的长度为2（或列表组件具有长度为1），这两个值将被解释为相对移位（旋转）中的x和y方向，分别，因此，将被回收作为需要（length(repetition)次，每次）。
参数：reassign
logical (default TRUE): if TRUE, 'small' tiles (as per min.frac and min.n arguments and get.small.tiles) are merged with (smallest) adjacent tiles. If FALSE, small tiles are 'eliminated', i.e. set to NA.
逻辑（默认TRUE）：如果TRUE，小砖（每min.frac和min.n参数和get.small.tiles）合并（最小）相邻瓷砖。如果FALSE，小砖被“淘汰”，即设置为NA。
参数：min.frac
numeric >=0, <1: minimum relative size of partition as percentage of sample; argument passed to get.small.tiles. Will be ignored if NULL.
数字> = 0，<1：最小相对的分区大小的样品的百分比;参数传递给get.small.tiles。将被忽略NULL。
参数：min.n
integer >=0: minimum number of samples per partition; argument passed to get.small.tiles. Will be ignored if NULL.
整数> = 0：最低数量的样本，每个分区的参数传递给get.small.tiles。将被忽略NULL。
参数：iterate
argument to be passed to tile.neighbors
参数：data
data.frame containing at least the columns specified by coords
data.frame的至少包含列指定的coords
参数：return.factor
if FALSE (default), return a represampling object; if TRUE (used internally by other sperrorest functions), return a list containing factor vectors (see Value)
如果FALSE（默认），返回一个represampling对象，如果TRUE（内部使用其他sperrorest功能的），返回一个list因子矢量（见值）
参数：repetition
numeric vector: cross-validation repetitions to be generated. Note that this is not the number of repetitions, but the indices of these repetitions. E.g., use repetition=c(1:100) to obtain (the 'first') 100 repetitions, and repetition=c(101:200) to obtain a different set of 100 repetitions.
数字向量：交叉验证的重复产生。注意，这是不重复的次数，但这些重复的指数。例如，使用repetition=c(1:100)（“第一个”）取得100个重复，和repetition=c(101:200)获得一组不同的重复100次。
参数：seed1
seed1+i is the random seed that will be used by set.seed in repetition i (i in repetition) to initialize the random number generator before sampling from the data set.
seed1+i是随机的种子，将用于set.seed重复i（irepetition）采样前的数据初始化随机数生成器设置。
值----------Value----------
A represampling object. Contains length(repetition) resampling objects as repetitions. The exact number of folds / test-set tiles within each resampling objects depends on the spatial configuration of the data set and possible cleaning steps
Arepresampling对象。包含length(repetition)resampling的对象作为重复的。倍数/测试集瓷砖每个resampling对象内的确切的数目依赖于数据集和可能的清洗步骤的空间结构的
注意----------Note----------
Default parameter settings may change in future releases. This function, especially the rotation and shifting part of it and the algorithm for cleaning up small tiles is still a bit experimental. Use with caution. For non-zero offsets (offset!="none")), the number of tiles may actually be greater than nsplit[1]*nsplit[2] because of fractional tiles lurking into the study region. reassign=TRUE with suitable thresholds is therefore recommended for non-zero (including random) offsets.
在将来的版本中，默认的参数设置可能会改变。此功能，尤其是旋转和移动的一部分，它和清理小瓷砖的算法仍然是一个有点实验性的。请谨慎使用。对于非零偏移量（offset!="none")），瓷砖的数量实际上可能大于nsplit[1]*nsplit[2]因为分数砖潜伏到研究区域。 reassign=TRUE因此，建议用合适的阈值为非零（包括随机）偏移。
参见----------See Also----------
sperrorest, as.resampling.factor, get.small.tiles, tile.neighbors
sperrorest，as.resampling.factor，get.small.tiles，tile.neighbors
实例----------Examples----------
data(ecuador)
parti = partition.tiles(ecuador, nsplit = c(4,3), reassign = FALSE)
plot(parti,ecuador)
summary(parti) # tile A4 has only 55 samples[瓷砖A4只有55个样本]
# same partitioning, but now merge tiles with less than 100 samples to adjacent tiles:[相同的分区，但现在少于100个样品，相邻的瓷砖瓷砖合并：]
parti2 = partition.tiles(ecuador, nsplit = c(4,3), reassign = TRUE, min.n = 100)
plot(parti2,ecuador)
summary(parti2)
# tile B4 (in 'parti') was smaller than A3, therefore A4 was merged with B4, not with A3[瓷砖B4（在“分区”）是小于A3，因此A4与B4合并，而不是A3]
# now with random rotation and offset, and tiles of 2000 m length:[现在随机旋转和偏移量，和2000米长的砖：]
parti3 = partition.tiles(ecuador, dsplit = 2000, offset = "random", rotation = "random", reassign = TRUE, min.n = 100)
plot(parti3,ecuador)
summary(parti3)
转载请注明:出自 生物统计家园网(http://www.biostatistic.net)。
注：
注1：为了方便大家学习，本文档为生物统计家园网机器人LoveR翻译而成，仅供个人R语言学习参考使用，生物统计家园保留版权。
注2：由于是机器人自动翻译，难免有不准确之处，使用时仔细对照中、英文内容进行反复理解，可以帮助R语言的学习。
注3：如遇到不准确之处，请在本贴的后面进行回帖，我们会逐渐进行修订。
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发表于 2012-9-30 15:03:36
