Addition of more points to a Plot in R Programming – points() Function

points() function in R Language is used to add a group of points of specified shapes, size and color to an existing plot.

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

Sample Scatter Plot:

# 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")

Output:

Here, a sample scatter plot is created for the addition of points.

Example 1: Adding points to scatterplots

# 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")

Output:

Example 2: Adding points of different properties

# 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")

Output: