biplot.rda(vegan)
biplot.rda()所属R语言包：vegan
PCA biplot
PCA双标图
译者：生物统计家园网 机器人LoveR
描述----------Description----------
Draws a PCA biplot with species scores indicated by biplot arrows
绘制一个物种分数用双标图箭头表示PCA双标图
用法----------Usage----------
## S3 method for class 'rda'
biplot(x, choices = c(1, 2), scaling = 2,
display = c("sites", "species"), type, xlim, ylim, col = c(1,2),
const, ...)
参数----------Arguments----------
参数：x
A rda result object.
Arda的结果对象。
参数：choices
Axes to show.
轴显示。
参数：scaling
Scaling for species and site scores. Either species (2) or site (1) scores are scaled by eigenvalues, and the other set of scores is left unscaled, or with 3 both are scaled symmetrically by square root of eigenvalues. With negative scaling values in rda, species scores are divided by standard deviation of each species and multiplied with an equalizing constant. Unscaled raw scores stored in the result can be accessed with scaling = 0.
缩放物种和现场评分。无论哪种物种（2）或网站（1）分数是由特征值进行缩放，并留下未缩放其他组分数，或用3都缩放平方根对称的特征值。负缩放值在rda，种分数除以标准差，每一个物种的平衡常数乘以。未调整的原始分数可以访问存储在结果scaling = 0。
参数：display
Scores shown. These must some of the alternatives "species" for species scores, and/or "sites" for site scores.
成绩显示出来。这些都必须一些替代品"species"种分数，和/或"sites"站点的分数。
参数：type
Type of plot: partial match to text for text labels, points for points, and none for setting frames only. If omitted, text is selected for smaller data sets, and points for larger. Can be of length 2 (e.g. type = c("text", "points")), in which case the first element describes how species scores are handled, and the second how site scores are drawn.
图：部分匹配text的文本标签，points点，和none帧类型。如果省略，text选择较小的数据集，并points较大。可以是长度为2（例如type = c("text", "points")），在这种情况下，第一元件描述如何物种的分数的处理，和所述第二站点分数如何绘制。
参数：xlim, ylim
the x and y limits (min, max) of the plot.
x和y的限制（最小值，最大值）的图。
参数：col
Colours used for sites and species (in this order). If only one colour is given, it is used for both.
地点和物种（按照这个顺序）使用的颜色。如果只有一种颜色，它是用于两个。
参数：const
General scaling constant for scores.rda.
一般的比例常数为scores.rda。
参数：...
Other parameters for plotting functions.
其他参数绘图功能。
Details
详细信息----------Details----------
Produces a plot or biplot of the results of a call to rda. It is common for the "species" scores in a PCA to be drawn as biplot arrows that point in the direction of increasing values for that variable. The biplot.rda function provides a wrapper to plot.cca to allow the easy production of such a plot.
产生一个图或双标图调用rda的结果。这是常见的“种”在PCA得分要绘制的双标图箭头的方向，增加该变量的值这一点。 biplot.rda功能提供了一个包装plot.cca允许这样一个图简单的生产。
biplot.rda is only suitable for unconstrained models. If used on an ordination object with constraints, an error is issued.
biplot.rda是只适用于无约束模型。如果用在协调对象的限制，则发出错误消息。
If species scores are drawn using "text", the arrows are drawn from the origin to 0.85 * species score, whilst the labels are drawn at the species score. If the type used is "points", then no labels are drawn and therefore the arrows are drawn from the origin to the actual species score.
如果种分数绘制使用"text"，绘制的箭头，从原点到0.85 *物种得分，而标签绘制的物种得分。如果使用的类型是"points"，然后没有标签被绘制，因此拔箭从产地到种的实际得分。
值----------Value----------
The plot function returns invisibly a plotting structure which can be used by identify.ordiplot to identify the points or other functions in the ordiplot family.
plot函数返回不可见的绘图结构，可以使用identify.ordiplot找准穴位或其他职能ordiplot家庭。
（作者）----------Author(s)----------
Gavin Simpson, based on <code><a href="plot.cca.html">plot.cca</a></code> by Jari Oksanen.
参见----------See Also----------
plot.cca, rda for something to plot, ordiplot for an alternative plotting routine and more support functions, and text,
plot.cca，rda的东西绘制，ordiplot的替代绘图程序和更多的支持功能，和text，
实例----------Examples----------
data(dune)
mod <- rda(dune, scale = TRUE)
biplot(mod, scaling = 3)
## different type for species and site scores[＃不同类型的物种和现场评分]
biplot(mod, scaling = 3, type = c("text", "points"))
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 2012-10-1 15:04:07
