#' Create Mulitple Plots with ggplots (from Winston Chang)
#'
#' This is the Multiple plot function from
#' \href{http://www.cookbook-r.com/Graphs/Multiple_graphs_on_one_page_(ggplot2)}{R-Cookbook}.
#' I have merely cleaned up some of the params for my use, added some documentation and examples.
#'
#' @param ... can pass ggplot objects
#' @param plotlist alternative to ..., list of ggplot objects
#' @param cols Number of columns in layout
#' @param 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.
#'
#' @examples
#' x<-rnorm(100)
#' y<-jitter(x,10000)
#' img <- readJPEG(system.file('img', 'Rlogo.jpg', package='jpeg'))
#' xdf<-data.frame(x=x,y=y)
#' firstplot<-ggplot(xdf,aes(x=x,y=y))+ geom_point()
#' secondplot<-ggplot(xdf,aes(x=x))+ geom_bar()
#' thirdplot<-ggplot(xdf, aes(x,y)) +
#' annotation_custom(rasterGrob(img, width=unit(1,'npc'), height=unit(1,'npc')),
#' -Inf, Inf, -Inf, Inf)
#' thirdplot
#' svg("test.svg",width=8)
#' multiplot(thirdplot,secondplot,firstplot,firstplot,layout=matrix(c(1,2,3,4),ncol=4,byrow=F))
#' dev.off()
#'
#' @export
#' @import ggplot2
multiplot <- function(..., plotlist = NULL, 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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