Create Dot Charts in R Programming – dotchart () Function

dotchart() function in R Language is used to create a dot chart of the specified data. A dot chart is defined as a plot which is used to draw a Cleveland dot plot.

Syntax: dotchart(x, labels = NULL, groups = NULL, gcolor = par(“fg”), color = par(“fg”)) Parameters: x: it is defined as numeric vector or matrix labels: a vector of labels for each point. groups: a grouping variable indicating how the elements of x are grouped. gcolor: color to be used for group labels and values. color: the color(s) to be used for points and labels.

Example 1:

r

# Dot chart of a single numeric vector
dotchart(mtcars$mpg, labels = row.names(mtcars),
         cex = 0.9, xlab = "mpg")

Output: Example 2:

r

# Plot and color by groups cyl
grps <- as.factor(mtcars$cyl)
my_cols <- c("blue", "darkgreen", "orange")
dotchart(mtcars$mpg, labels = row.names(mtcars),
         groups = grps, gcolor = my_cols,
         color = my_cols[grps],
         cex = 0.9,  pch = 22, xlab = "mpg")

Output:

Example :

R

# Create a vector of data
data <- c(3, 8, 12, 15, 19, 22, 24, 27, 30)

# Create a vector of labels for the data points
labels <- c("A", "B", "C", "D", "E", "F", "G", "H", "I")

# Create a dot chart
dotchart(data, labels = labels, main = "Dot Chart Example", xlab = "Value", ylab = "Label")

output :