#DRAWING TWO CURVES ON ONE GRAPH R HOW TO#

Please accept YouTube cookies to play this video. Hence, we first have to install and load the reshape2 package: We will use the functions of the reshape2 package to transform our data from wide to long format. The following syntax shows a more general approach for the plotting of multiple lines for each group in a ggplot2 plot by reshaping our data frame from wide to long format.

However, this methodology is not convenient for a large number of lines, since we would have to specify the geom_line function for each line we want to draw.

#DRAWING TWO CURVES ON ONE GRAPH R HOW TO#

In Example 1 you have learned how to use the geom_line function several times for the same graphic. The output of the previous R programming syntax is shown in Figure 1: It’s a ggplot2 line graph showing multiple lines.Įxample 2: Plotting Two Lines in Same ggplot2 Graph Using Data in Long Format Ggp1 <- ggplot(data, aes(x)) + # Create ggplot2 plot Geom_line (aes (y = y2 ), color = 'blue' ) Geom_line (aes (y = y1 ), color = 'red' ) +

Ggp1 <- ggplot (data, aes (x ) ) + # Create ggplot2 plot If we want to create a plot of our data with the ggplot2 package, we also have to install and load ggplot2: The variables y1 and y2 represent the y-axis values of two different lines we will draw in this tutorial. The variable x ranges from 1 to 50 and represents the x-axis values of our plot. It shows that our example data consists of three columns. Have a look at the previous output of the RStudio console.

Drawing two curves on one graph r