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R Bars

Bar plots in R are used to display data in rectangular bars. The barplot() function is used to create both vertical and horizontal bar plots.

Key Topics

Bar Plot Example

# Creating a bar plot
values <- c(5, 10, 15, 20)
names <- c("A", "B", "C", "D")

barplot(values, names.arg = names, main = "Bar Plot Example", col = "blue")

Output:

A bar plot with four bars labeled A, B, C, and D, colored in blue.

Code Explanation: The barplot() function creates a bar plot with bars representing the values in the values vector. The names.arg parameter adds labels to the bars.

Customizing Bar Plot

Bar plots can be customized by changing the color, orientation, and adding labels.

# Horizontal bar plot with custom colors
barplot(values, names.arg = names, main = "Horizontal Bar Plot", 
        col = c("red", "green", "blue", "yellow"), horiz = TRUE)

Output:

A horizontal bar plot with bars in red, green, blue, and yellow.

Code Explanation: The horiz parameter is set to TRUE to create a horizontal bar plot. Colors are specified using a vector in the col parameter.

Key Takeaways

  • Use the barplot() function to create bar plots in R.
  • Bar plots can be oriented vertically or horizontally.
  • Colors and labels can be customized for better visualization.
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