Side by Side pie charts in R
In this article, we will discuss how to draw Pie Charts side by side in R Programming Language.
Method 1: Using base R functions
To draw plots side by side par() function is used.
Syntax:
par(mfrow, mar, mgp, las)
Parameters:
- mfrow– A numeric vector of length 2, which sets the rows and column in which frame has to be divided.
- mar – A numeric vector of length 4, which sets the margin sizes in the following order: bottom, left, top, and right.
- mgp – A numeric vector of length 3, which sets the axis label locations relative to the edge of the inner plot window.
- las – A numeric value indicating the orientation of the tick mark labels and any other text added to a plot after its initialization.
The plots are drawn normally and independent of others. For drawing them side-by-side pass the number of rows and columns as if a grid is being defined.
Example:
R
# Define data-set columnsx1 <- c(31,13,25,31,16)x2 <- c(12,23,43,12,22,45,32) label1 <- c('geek','geek-i-knack','technical-scripter', 'content-writer','problem-setter')label2 <- c('sun','mon','tue','wed','thur','fri','sat') # set the plotting area into a 1*2 arraypar(mfrow=c(1,2)) # Draw the two pie chart using above datasetspie(x1, label1,main="Students per Event", col=rainbow(length(x1)))pie(x2, label2,main="Students per day in a week") |
Output:
Method 2: Using ggplot2
In this grid.arrange() is used to arrange the plots on a frame.
Syntax:
grid.arrange(plot, nrow, ncol)
Parameter:
- plot- ggplot2 plot which we want to arrange
- nrow- Number of rows
- ncol- Number of columns
Here, plots are drawn normally and independently. Then, the function is called with these plots and the number of rows and columns in a way that a grid is being defined.
Example:
R
# Define data-set columnsx1 <- c(31,13,25,31,16)x2 <- c(12,23,43,12,22,45,32) x3 <- c(234,123,210) label1 <- c('geek','geek-i-knack','technical-scripter', 'content-writer','problem-setter')label2 <- c('sun','mon','tue','wed','thur','fri','sat') label3 <- c('solved','attempted','unsolved') # Create data frame using above # data columndata1 <- data.frame(x1,label1)data2 <- data.frame(x2,label2)data3 <- data.frame(x3,label3) # set the plotting area into a 1*3 arraypar(mfrow=c(1,3)) # import library ggplot2 and gridExtralibrary(ggplot2)library(gridExtra) # Draw the two pie chart using above datasetsplot1<-ggplot(data1, aes(x="", y=x1, fill=label1)) +geom_bar(stat="identity", width=1) + coord_polar("y", start=0) plot2<-ggplot(data2, aes(x="", y=x2, fill=label2)) + geom_bar(stat="identity", width=1) + coord_polar("y", start=0) plot3<-ggplot(data3, aes(x="", y=x3, fill=label3)) +geom_bar(stat="identity", width=1) + coord_polar("y", start=0) # Use grid.arrange to put plots in columnsgrid.arrange(plot1, plot2, plot3, ncol=3) |
Output:
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