Combine plots in R
问题 I have several plots that I want to combine them together and add a title to the combined plot, but somehow I cannot combine them using R. (using RStudio) Combine two residual plots plotted by using plot(resid(lme)) where lme is a linear mixed model. Combine two interaction plots plotted by using interaction.plot(x1,x2,y) where x1 and x2 are the two independent variables, and y is the dependent variable. I tried to store the plots as variables and use grid.arrange , but they cannot be stored