- R Tutorial
- R - Home
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- R Charts & Graphs
- R - Pie Charts
- R - Bar Charts
- R - Boxplots
- R - Histograms
- R - Line Graphs
- R - Scatterplots

- R Statistics Examples
- R - Mean, Median & Mode
- R - Linear Regression
- R - Multiple Regression
- R - Logistic Regression
- R - Normal Distribution
- R - Binomial Distribution
- R - Poisson Regression
- R - Analysis of Covariance
- R - Time Series Analysis
- R - Nonlinear Least Square
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- R - Random Forest
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- R - Chi Square Tests

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# R - Bar Charts

A bar chart represents data in rectangular bars with length of the bar proportional to the value of the variable. R uses the function **barplot()** to create bar charts.
R can draw both vertical and Horizontal bars in the bar chart.
In bar chart each of the bars can be given different colors.

### Syntax

The basic syntax to create a bar-chart in R is −

barplot(H,xlab,ylab,main, names.arg,col)

Following is the description of the parameters used −

**H**is a vector or matrix containing numeric values used in bar chart.**xlab**is the label for x axis.**ylab**is the label for y axis.**main**is the title of the bar chart.**names.arg**is a vector of names appearing under each bar.**col**is used to give colors to the bars in the graph.

### Example

A simple bar chart is created using just the input vector and the name of each bar.

The below script will create and save the bar chart in the current R working directory.

# Create the data for the chart H <- c(7,12,28,3,41) # Give the chart file a name png(file = "barchart.png") # Plot the bar chart barplot(H) # Save the file dev.off()

When we execute above code, it produces following result −

## Bar Chart Labels, Title and Colors

The features of the bar chart can be expanded by adding more parameters. The **main** parameter is used to add **title**. The **col** parameter is used to add colors to the bars. The **args.name** is a vector having same number of values as the input vector to describe the meaning of each bar.

### Example

The below script will create and save the bar chart in the current R working directory.

# Create the data for the chart H <- c(7,12,28,3,41) M <- c("Mar","Apr","May","Jun","Jul") # Give the chart file a name png(file = "barchart_months_revenue.png") # Plot the bar chart barplot(H,names.arg=M,xlab="Month",ylab="Revenue",col="blue", main="Revenue chart",border="red") # Save the file dev.off()

When we execute above code, it produces following result −

## Group Bar Chart and Stacked Bar Chart

We can create bar chart with groups of bars and stacks in each bar by using a matrix as input values.

More than two variables are represented as a matrix which is used to create the group bar chart and stacked bar chart.

# Create the input vectors. colors = c("green","orange","brown") months <- c("Mar","Apr","May","Jun","Jul") regions <- c("East","West","North") # Create the matrix of the values. Values <- matrix(c(2,9,3,11,9,4,8,7,3,12,5,2,8,10,11), nrow = 3, ncol = 5, byrow = TRUE) # Give the chart file a name png(file = "barchart_stacked.png") # Create the bar chart barplot(Values, main = "total revenue", names.arg = months, xlab = "month", ylab = "revenue", col = colors) # Add the legend to the chart legend("topleft", regions, cex = 1.3, fill = colors) # Save the file dev.off()