现代统计图形 - 科学网—博客

5.12 颜色等高图 89
1 > dotchart(t(VADeaths)[, 5:1], panel.first = grid(ny = NA),
2 + cex = 0.8, xlim = c(0, max(VADeaths)), bg = brewer.pal(4,
3 + "Set1"))
70-74
Urban Female
Urban Male
Rural Female
Rural Male
65-69
Urban Female
Urban Male
Rural Female
Rural Male
60-64
Urban Female
Urban Male
Rural Female
Rural Male
55-59
Urban Female
Urban Male
Rural Female
Rural Male
50-54
Urban Female
Urban Male
Rural Female
Rural Male
0 10 20 30 40 50 60 70
图 5.16: 弗吉尼亚死亡率数据的Cleveland点图
5.12 颜色等高图/层次图
颜色等高图,Cleveland (1993)又称之为层次图(Level Plot),与等高
图的原理完全类似,只是颜色等高图用不同颜色表示不同高度,并配有颜
色图例,用以说明图中的颜色与高度值的对应关系。读者可以回顾5.8小节
关于等高图的介绍。
R中的颜色等高图函数为filled.contour(),其用法如下:
1 > usage(filled.contour)
filled.contour(x = seq(0, 1, length.out = nrow(z)),
y = seq(0, 1, length.out = ncol(z)), z, xlim = range(x,