#' Function for creating multiple 'ggplot()'s on one plot page (uses the `{grid}` package with `{ggplot2}`)
#'
#' [^mp]: \rurl{http://www.cookbook-r.com/Graphs/Multiple_graphs_on_one_page_(ggplot2)/}
#'
#'
mp <- 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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