I use ggplot() + geom_line() function to draw a line plot for girls.
When I create the plot for girls it shows well as below.
But I cannot combine two line plots( both boys and girls) by " +". It shows the errors as below.
Does anyone know what I need to do for combining these two plots?
I use ggplot() + geom_line() function to draw a line plot for girls. When I create the plot for girls it shows well as below.
But I cannot combine two line plots( both boys and girls) by " +". It shows the errors as below. Does anyone know what I need to do for combining these two plots?