R- scatter plots

目录

• Generic X-Y plot定义
  • 1 添加x、y标签
  • 2 添加主标题，参数main
  • 3 添加副标题，参数sub
  • 4 添加颜色，参数col
  • 5 添加xy轴显示限制，参数xlim
  • 6 图状、点状、线状
  • 7 平滑曲线
  • 8 画函数图像

Generic X-Y plot定义

plot(x, y, ...) # ?plot 请查看帮助文档

代码及结果：

#打开数据集前6行
head(cars)

cars数据集

plot(x,y)

plot(x = cars$speed, y = cars$dist)

speed为x,dist为y

plot(x = cars$dist, y = cars$speed)
#It probably makes more sense for speed to go on the x-axis since stopping distance is a function of speed #more than the other way around

dist为x,speed为y

1 添加x、y标签

#添加x、y标签
plot(x = cars$speed, y = cars$dist, xlab = "Speed", ylab = "Distance")

添加x、y标签

2 添加主标题，参数main

#添加主标题，参数main
plot(x = cars$speed, y = cars$dist,xlab = "Speed", ylab = "Stopping Distance", main = "My Plot")

添加主标题

3 添加副标题，参数sub

#添加副标题，参数sub
plot(cars, main = "My Plot", sub ="My Plot Subtitle")

添加副标题

4 添加颜色，参数col

#添加颜色，参数col
plot(cars, col = 2)

添加颜色

5 添加xy轴显示限制，参数xlim

#添加xy轴显示限制，参数xlim
plot(cars, xlim = c(10,15))

添加xy轴显示限制

6 图状、点状、线状

type 图形状9种
pch 点形状25种
lty 线形状6种
点的大小

# pch & lty &type &cex
plot(1:10,pch = c("@","$","#","&","%"), type = "b", lty = 3, cex =0.5, main = "Sarge says to Beetle...")

点、线、类型设置

7 平滑曲线

require(stats) # for lowess, rpois, rnorm
plot(cars)
lines(lowess(cars)) #R平滑曲线的方法之一lowess()

R平滑曲线

8 画函数图像

plot(sin, -pi, 2*pi) # see ?plot.function

sin(x), x [-pi, 2*pi]

# 泊松分布100个观测值，lambda = 5
plot(table(rpois(100, 5)), type = "h", col = "red", lwd = 5,
     main = "rpois(100, lambda = 5)")

泊松分布
参考文章：
coursera R programming week4