在 R 编程中向绘图中添加更多点 – points()函数

R 语言中的points()函数用于将一组具有指定形状、大小和颜色的点添加到现有绘图中。

Syntax: points(x, y, cex, pch, col)

Parameters:
x, y: Vector of coordinates
cex: size of points
pch: shape of points
col: color of points

样本散点图：

# R program to create a scatter plot
  
# Creating coordinate vectors
x <- c(1.3, 3.5, 1.4, -3.1, 5.7, 2.4, 3.3, 2.5, 2.3, 1.9, 1.8, 2.3)
y <- c(2.5, 5.8, 2.1, -3, 12, 5, 6.2, 4.8, 4.2, 3.5, 3.7, 5.2)
  
# Plotting the graph
plot(x, y, cex = 1, pch = 3, xlab ="x", ylab ="y", col ="black")

输出：

在这里，为添加点创建了一个样本散点图。

示例 1：向散点图添加点

# R program to add points to a plot
  
# Creating coordinate vectors
x <- c(1.3, 3.5, 1.4, -3.1, 5.7, 2.4, 3.3, 2.5, 2.3, 1.9, 1.8, 2.3)
y <- c(2.5, 5.8, 2.1, -3, 12, 5, 6.2, 4.8, 4.2, 3.5, 3.7, 5.2)
plot(x, y, cex = 1, pch = 3, xlab ="x", ylab ="y", col ="black")
  
# Creating coordinates to be added  
x2 <- c(4.2, 1.2, -2.4, -0.3, -1.3, 2.5)
y2 <- c(2.4, 4.3, 1.4, 2.3, -2, 4.5)
  
# Calling points() function
points(x2, y2, cex = 2, pch = 6, col ="blue")

输出：

示例 2：添加不同属性的点

# R program to add points to a plot
  
# Creating coordinate vectors
x <- c(1.3, 3.5, 1.4, -3.1, 5.7, 2.4, 3.3, 2.5, 2.3, 1.9, 1.8, 2.3)
y <- c(2.5, 5.8, 2.1, -3, 12, 5, 6.2, 4.8, 4.2, 3.5, 3.7, 5.2)
plot(x, y, cex = 1, pch = 3, xlab ="x", ylab ="y", col ="black")
  
# Creating coordinates to be added  
x2 <- c(4.2, 1.2, -2.4, -0.3, -1.3, 2.5)
y2 <- c(2.4, 4.3, 1.4, 2.3, -2, 4.5)
  
# Calling points() function
points(x2, y2, cex = 2, pch = 6, col ="blue")
  
# Adding points of different shape and size
x3 <- c(4, 0)
y3 <- c(7, -2)
  
points(x3, y3, cex = 4, pch = 14, col ="green")

输出：