quadrats(spatstat)
quadrats()所属R语言包：spatstat
Divide Region into Quadrats
分割区样方
译者：生物统计家园网 机器人LoveR
描述----------Description----------
Divides window into rectangular quadrats and returns the quadrats as a tessellation.
将窗口镶嵌长方形样地和样方返回。
用法----------Usage----------
quadrats(X, nx = 5, ny = nx, xbreaks = NULL, ybreaks = NULL, keepempty=FALSE)
参数----------Arguments----------
参数：X
A window (object of class "owin") or anything that can be coerced to a window using as.owin, such as a point pattern.
一个窗口，（对象类"owin"）或任何可以强制转换为一个窗口，使用as.owin，如点图案。
参数：nx,ny
Numbers of quadrats in the x and y directions. Incompatible with xbreaks and ybreaks.
的样方数在x和y的方向。不兼容的xbreaks和ybreaks。
参数：xbreaks
Numeric vector giving the x coordinates of the boundaries of the quadrats. Incompatible with nx.
数值向量给x的样方的边界的坐标。不相容的nx。
参数：ybreaks
Numeric vector giving the y coordinates of the boundaries of the quadrats. Incompatible with ny.
数值向量给y的样方的边界的坐标。不相容的ny。
参数：keepempty
Logical value indicating whether to delete or retain empty quadrats. See Details.
逻辑值，该值指示是否保留或删除空的样方。查看详细信息。
Details
详细信息----------Details----------
If the window X is a rectangle, it is divided into an nx * ny grid of rectangular tiles or "quadrats".
如果窗口X是一个矩形，它被分成一个nx * ny网格的矩形砖或样方。
If X is not a rectangle, then the bounding rectangle of X is first divided into an nx * ny grid of rectangular tiles, and these tiles are then intersected with the window X.
如果X是不是一个矩形，然后在边界矩形X首先被划分成一个nx * ny格的矩形砖，瓷砖，然后相交的窗口X 。
The resulting tiles are returned as a tessellation (object of class "tess") which can be plotted and used in other analyses.
将所得的砖作为镶嵌（返回类对象"tess"）可以绘制和其它分析中使用。
If xbreaks is given, it should be a numeric vector giving the x coordinates of the quadrat boundaries. If it is not given, it defaults to a sequence of nx+1 values equally spaced over the range of x coordinates in the window X$window.
如果xbreaks，它应该是一个数值向量给x样方的边界坐标。如果没有给出，它默认的序列nx+1值同样间隔的窗口xX$window坐标的范围内。
Similarly if ybreaks is given, it should be a numeric vector giving the y coordinates of the quadrat boundaries. It defaults to a vector of ny+1 values equally spaced over the range of y coordinates in the window. The lengths of xbreaks and ybreaks may be different.
同样，如果ybreaks，它应该是一个数值向量给y样方的边界坐标。它默认的向量ny+1值y在窗口中的坐标的范围内，同样间隔。的长度xbreaks和ybreaks可能是不同的。
By default (if keepempty=FALSE), any rectangular tile which does not intersect the window X is ignored, and only the non-empty intersections are treated as quadrats, so the tessellation may consist of fewer than nx * ny tiles. If keepempty=TRUE, empty intersections are retained, and the tessellation always contains exactly nx * ny tiles, some of which may be empty.
默认情况下（如果keepempty=FALSE），任何长方形瓷砖不相交窗口X被忽略，只有非空的交集视为样方，所以Tessellation（曲面细分）可能包括少于nx * ny地砖。如果keepempty=TRUE，空交叉点被保留，Tessellation（曲面细分）总是包含完全nx * ny砖，其中一些可能是空的。
值----------Value----------
A tessellation (object of class "tess") as described under tess.
类的对象，一个Tessellation（曲面细分）（"tess"）在tess。
（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>
and Rolf Turner
<a href="mailto:r.turner@auckland.ac.nz">r.turner@auckland.ac.nz</a>
参见----------See Also----------
tess, quadratcount, quadrat.test, quadratresample
tess，quadratcount，quadrat.test，quadratresample
实例----------Examples----------
W <- square(10)
Z <- quadrats(W, 4, 5)
plot(Z)
data(letterR)
plot(quadrats(letterR, 5, 7))
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 14:03:32
