#'@title Plot multiple ggplot graphs on the same page.
#'
#'@param ... - multiple ggplot objects
#'@param plotlist - a list of ggplot objects
#'@param cols - number of columns in layout
#'@param layout - a matrix specifying the layout. If present, 'cols' is ignored.
#'
#'@details 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.
#'
#' Based on the 'multiplot' function from the "Cookbook for R" (www.cookbook-r.com).
#'
#'@import grid
#'@import ggplot2
#'
#'@export
#'
plotMulti.GG<-function(..., plotlist=NULL, file, cols=1, layout=NULL) {
# Make a list from the ... arguments and plotlist
plots <- c(list(...), plotlist)
numPlots = length(plots)
# If layout is NULL, then use 'cols', 'rows' to determine layout
if (is.null(layout)) {
if (is.null(rows)) rows <- ceiling(numPlots/cols);
layout <- matrix(seq(1, cols * rows),ncol = cols, nrow = rows)
}
# Make each plot, in the correct location
mxp<-max(layout);
for (p in 1:numPlots) {
i <- (p-1) %% mxp;#modulo
if (i==0){
# Set up a new page
grid.newpage()
pushViewport(viewport(layout = grid.layout(nrow(layout), ncol(layout))))
}
# Get the i,j matrix positions of the regions that contain this subplot
matchidx <- as.data.frame(which(layout == i+1, arr.ind = TRUE))
print(plots[[p]], vp = viewport(layout.pos.row = matchidx$row,
layout.pos.col = matchidx$col));
}
}
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