#' Multiple plot
#'
#' Not mine, taken from
#' http://www.cookbook-r.com/Graphs/Multiple_graphs_on_one_page_(ggplot2)/
#'
#' @param ... ggplot objects
#' @param plotlist ggplot objects (alternative)
#' @param ncol Number of columns in layout
#' @param layout A matrix specifying the layout. If present, 'ncol' 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.
#'
#' @return nothing
#' @export
#'
#' @examples
#' # First plot
#' library(ggplot2)
#' p1 <- ggplot(ChickWeight, aes(x=Time, y=weight, colour=Diet, group=Chick)) +
#' geom_line() +
#' ggtitle("Growth curve for individual chicks")
#' # Second plot
#' p2 <- ggplot(ChickWeight, aes(x=Time, y=weight, colour=Diet)) +
#' geom_point(alpha=.3) +
#' geom_smooth(alpha=.2, size=1) +
#' ggtitle("Fitted growth curve per diet")
#' multiplot(p1, p2, ncol = 2)
multiplot <- function(..., plotlist=NULL, ncol = 1, layout=NULL) {
# Make a list from the ... arguments and plotlist
plots <- c(list(...), plotlist)
numPlots = length(plots)
# If layout is NULL, then use 'ncol' to determine layout
if (is.null(layout)) {
# Make the panel
# ncol: Number of columns of plots
# nrow: Number of rows needed, calculated from # of ncol
layout <- matrix(seq(1, ncol * ceiling(numPlots/ncol)),
ncol = ncol, nrow = ceiling(numPlots/ncol))
}
if (numPlots==1) {
print(plots[[1]])
} else {
# Set up the page
grid::grid.newpage()
grid::pushViewport(
grid::viewport(layout = grid::grid.layout(nrow(layout), ncol(layout)))
)
# Make each plot, in the correct location
for (i in seq(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 = grid::viewport(layout.pos.row = matchidx$row,
layout.pos.col = matchidx$col))
}
}
}
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