r-faq - w3toppers.com

How to measure similarity between strings?

R: How to split a data frame into training, validation, and test sets?

How can I read the source code for an R function?

How to order my dataframe lexicographicaly

Convert a vector into a list, each element in the vector as an element in the list

How to get mean, median, and other statistics over entire matrix, array or dataframe?

How to convert character of percent into numeric in R

Plot two graphs in a same plot

lines() or points() will add to the existing graph, but will not create a new window. So you’d need to do plot(x,y1,type=”l”,col=”red”) lines(x,y2,col=”green”)

Different legend-keys inside same legend in ggplot2

You can use override.aes= inside guides() function to change default appearance of legend. In this case your guide is color= and then you should set shape=c(NA,16) to remove shape for line and then linetype=c(1,0) to remove line from point. ggplot(df) + geom_line(aes(id, line, colour = “line”)) + geom_point(aes(id, points, colour = “points”))+ guides(color=guide_legend(override.aes=list(shape=c(NA,16),linetype=c(1,0))))