更改R Scatterplot3D中的ylab位置 [英] Change ylab position in R Scatterplot3D

问题描述

我正在使用R scatterplot3D，并且需要在标签中使用expression()，因为我必须使用一些希腊字母；
我的问题是:有没有办法拉下y.lab名称或沿轴(对角线位置)写它?我去帮助并打包了说明，但似乎没有任何效果. 预先感谢您的任何帮助 玛丽亚

I´m working with R scatterplot3D and I need to use expression() in labels because I have to use some Greek letters;
my question is: is there a way to pull the y.lab name down or write it along the axis (in a diagonal position)? I went to help and packages description but nothing seems to work; thanks in advance for any help Maria

library(scatterplot3d)
par(mfrow=c(1,1))
A <- c(3,2,3,3,2)
B <- c(2,4,5,3,4)
D <- c(4,3,4,2,3)
scatterplot3d(A,D,B, xlab=expression(paste(x[a],"-",x[b])), 
                     ylab=expression(x[a]), 
                     zlab=expression(sigma^2))

推荐答案

由于scatterplot3d()函数构造图的方式，您无法使用任何经典方式.它基本上是在经典绘图窗格的顶部绘制的，这意味着轴标签已绑定到经典位置.在左侧的Y轴上打印z标签，在右侧的Y轴上打印y标签.

You can't use any of the classic ways due to the way the scatterplot3d() function constructs the plot. It's basically plotted on top of a classic plot pane, which means the axis labels are bound to the classic positions. The z-label is printed at the real left Y-axis, and the y label is printed at the real right Y-axis.

您可以使用text()来解决此问题:

You can use text() to get around this:

• 使用par("usr")获取X和Y坐标的限制
• 计算标签要放置的位置(例如，水平位置为90％，垂直位置为8％).
• 使用text()放置它(可能使用参数srt来旋转标签)

• use par("usr") to get the limits of the X and Y coordinates
• calculate the position you want the label on (at 90% of the horizontal position and 8% of the vertical position for example.)
• use text() to place it (and possibly the parameter srt to turn the label)

这使它更具通用性，因此您不必为制作的每个新图尝试使用不同的值.

This makes it a bit more generic, so you don't have try different values for every new plot you make.

示例:

scatterplot3d(A,D,B, xlab=expression(paste(x[a],"-",x[b])),
                     ylab="",
                     zlab=expression(sigma^2))
dims <- par("usr")
x <- dims[1]+ 0.9*diff(dims[1:2])
y <- dims[3]+ 0.08*diff(dims[3:4])
text(x,y,expression(x[a]),srt=45)

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