#' Multiple plot function
#'
#' This function plots multiple ggplot objects passed in as either ..., or to plotlist
#' (as a list of ggplot objects).
#'
#' @param ... Required. Multiple ggplot objects, or a plotlist as a list of
#' ggplot objects
#' @param plotlist Optional. A list of ggplot objects. (Default = NULL)
#' @param file Optional. A file name to save the plot as, currently non-functional.
#' (Default=NULL)
#' @param cols Optional. (Default = 1)
#' @param layout Optional. The plot layout as a matrix. eg. if
#' `layout = 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 A ggplot image
#'
#' @export
multiplot <- function(..., plotlist=NULL, file = NULL, 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::grid.newpage()
grid::pushViewport(grid::viewport(layout = grid::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 = grid::viewport(layout.pos.row = matchidx$row,
layout.pos.col = matchidx$col))
}
}
}
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