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November 25, 2015 00:45
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Multi-plot
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# Adopted from http://www.cookbook-r.com/Graphs/Multiple_graphs_on_one_page_(ggplot2) | |
# And uploaded as gist for my personal use. | |
# | |
# 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) { | |
library(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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