其中一个可用于交互式3D图形绘制的软件包是rgl。我想要做的是构建一个带有颜色编码的三维散点图,根据某些因子变量进行编码。该三维散点图是基于plsr分析得出的载荷结果。
生成的图表如下所示:
下面是示例数据的表格:
> loadings
| Comp 1 | Comp 2 | Comp 3 | Class
-------------------------------------------------------------------------------------------
TEMP | -0.0607044182964255 | "0.0437618450165671" |"0.045124991801441" | "global"
MW | "-0.13414890573833" | "-0.0970537799069731" |0.263043734662182" | "local"
DM |"-0.183751529577861" | "-0.102703237685933" |"0.0640549385564205" | "global"
CHG |"-0.0558781715833019"| "0.125155347350922" |"-0.119258450107321" | "local"
或者可以生成:
loadings <- data.frame(Comp1 = c(1.2, 3.4, 5.6, 13.1), Comp2 = c(4.3, 1.2, 7.7, 9.8),
Comp3 = c(1.2,6.9,15.6,15.0),
row.names = c("TEMP", "MW", "DM", "CHG"),
Class = c("global", "local", "global", "local"))
scatter3d(x=loadings[[1]], y=loadings[[2]], z=loadings[[3]],
point.col = as.numeric(as.factor(loadings[,4])), size = 10)
获得的图形具有相同的风格,但更简单,因为变量“Class”只有两个级别:“全局”和“本地”。
问题是: 是否可以在rgl中添加图例,或者可以将一些独立的图例附加到图形上?
答案是:
scatter3d(x=loadings[[1]], y=loadings[[2]], z=loadings[[3]],
point.col = as.numeric(as.factor(loadings[,4])), size = 10, type = 's')
text3d(x=1.1, y=c(.9,1), z=1.1,levels(loadings[[4]]),col="black")
points3d(x=1.2,y=c(.9,1),z=1.1, col=as.numeric(as.factor(loadings[,4])), size=5)
按类别标注的图表: