现代统计图形 - 科学网—博客

4.3 曲线、直线、线段、箭头、X-样条 47
1 > # 不作图,只画出框架,且指定坐标轴范围
2 > plot(1:10, type = "n", xlim = c(0, 10), ylim = c(0,
3 + 10))
4 > # 10个正态随机数绝对值的波动线
5 > lines(1:10, abs(rnorm(10)))
6 > # 不同的直线
7 > abline(a = 0, b = 1, col = "gray")
8 > abline(v = 2, lty = 2)
9 > abline(h = 2, lty = 2)
10 > #添加文本
11 > text(8, 3, "abline(a = 0, b = 1)")
12 > # 添加箭头
13 > arrows(8, 3.5, 6, 5.7, angle = 40)
14 > # 参数用了向量:不同灰度的线段
15 > segments(rep(3, 4), 6:9, rep(5, 4), 6:9, col = gray(seq(0.2,
16 + 0.8, length = 4)))
17 > text(4, 9.8, "segments")
1:10
0 2 4 6 8 10
segments
0 2 4 6 8 10
Index
abline(a = 0, b = 1)
图 4.5: 曲线、直线、直线段、箭头的展示说明