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#' Multiple plot function
#'
#' Multiplot allows the laying out of multiple charts in a custom layout
#'
#' @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
#' @param ... ggplot objects can be passed in ...
#'
#' @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.
#'
#' Code is taken as-is from \url{http://www.cookbook-r.com/Graphs/Multiple_graphs_on_one_page_(ggplot2)/}
#' and no tests are maintained for it at present
#'
#' @keywords ggplot2 multiple charts
#' @family visualisation
#'
#' @export
#'
multiplot <- function(..., plotlist = NULL, 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' 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.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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