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
dotchart (mtcars$mpg, labels = row.names (mtcars),
cex = 0.9, xlab = "mpg")
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Output:
Example 2:
r
grps <- as.factor (mtcars$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")
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Output: 
Example :
R
data <- c (3, 8, 12, 15, 19, 22, 24, 27, 30)
labels <- c ( "A" , "B" , "C" , "D" , "E" , "F" , "G" , "H" , "I" )
dotchart (data, labels = labels, main = "Dot Chart Example" , xlab = "Value" , ylab = "Label" )
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output :