How to create a line chart for a subset of a data frame using ggplot2 in R?

Subsetting is not a difficult thing in R but if we make our code short then it is a little tedious task because we will have to introduce code between codes and that creates confusion. Therefore, we must be very careful while writing a code inside another code. To create a line with subsetting the data frame using ggplot function of ggplot2 can be done by using subset function.

Example

ggplot(subset(df,x1 %in% c("Sample1","Sample2","Sample3")))+
+ geom_line(aes(x2,x3,group=x1,colour=x1))

Output