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- # Multiple plot function
- #
- # ggplot objects can be passed in ..., or to plotlist (as a list of ggplot objects)
- # - cols: Number of columns in layout
- # - layout: A matrix specifying the layout. If present, 'cols' is ignored.
- #
- # If the layout is something like matrix(c(1,2,3,3), nrow=2, byrow=TRUE),
- # then plot 1 will go in the upper left, 2 will go in the upper right, and
- # 3 will go all the way across the bottom.
- #
- multiplot <- function(..., plotlist=NULL, file, cols=1, layout=NULL) {
- require(grid)
- # Make a list from the ... arguments and plotlist
- plots <- c(list(...), plotlist)
- numPlots = length(plots)
- # If layout is NULL, then use 'cols' to determine layout
- if (is.null(layout)) {
- # Make the panel
- # ncol: Number of columns of plots
- # nrow: Number of rows needed, calculated from # of cols
- layout <- matrix(seq(1, cols * ceiling(numPlots/cols)),
- ncol = cols, nrow = ceiling(numPlots/cols))
- }
- if (numPlots==1) {
- print(plots[[1]])
- } else {
- # Set up the page
- grid.newpage()
- pushViewport(viewport(layout = grid.layout(nrow(layout), ncol(layout))))
- # Make each plot, in the correct location
- for (i in 1:numPlots) {
- # Get the i,j matrix positions of the regions that contain this subplot
- matchidx <- as.data.frame(which(layout == i, arr.ind = TRUE))
- print(plots[[i]], vp = viewport(layout.pos.row = matchidx$row,
- layout.pos.col = matchidx$col))
- }
- }
- }
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