How to set the Y-axis tick marks using ggplot2 in R?

The default value of Y-axis tick marks using ggplot2 are taken by R using the provided data but we can set it by using scale_y_continuous function of ggplot2 package. For example, if we want to have values starting from 1 to 10 with a gap of 1 then we can use scale_y_continuous(breaks=seq(1,10,by=1)).

Example

 Live Demo

Consider the below data frame: x<-rpois(20,5) y<-rpois(20,2) df<-data.frame(x,y) df

Output

   x y 1  8 1 2  4 3 3  1 1 4  4 1 5  3 2 6  3 6 7  6 4 8  3 3 9  7 1 10 4 1 11 5 1 12 6 3 13 3 1 14 6 3 15 8 2 16 0 2 17 8 1 18 5 0 19 4 1 20 4 3

Loading ggplot2 package and creating a point chart between x and y −

Example

library(ggplot2) ggplot(df,aes(x,y))+geom_point()

Output

Creating the point chart with Y-axis tick marks with a difference of 1 −

Example

ggplot(df,aes(x,y))+geom_point()+scale_y_continuous(breaks=seq(1,10,by=1))

Output