#  File src/library/graphics/R/matplot.R
#  Part of the R package, https://www.R-project.org
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## Author: Martin Maechler, Date: 27 Jun 97

matpoints <-
    function(x, y,  type = "p", lty = 1:5, lwd = 1, pch = NULL, col = 1:6, ...)
    matplot(x = x, y = y, type  =  type, lty = lty, lwd = lwd, pch = pch,
            col = col, add = TRUE, ...)

matlines  <-
    function(x, y, type = "l", lty = 1:5, lwd = 1, pch = NULL, col = 1:6, ...)
    matplot(x = x, y = y, type = type, lty = lty, lwd = lwd, pch = pch,
            col = col, add = TRUE, ...)

matplot <- function(x, y, type = "p",
		    lty = 1:5, lwd = 1, lend = par("lend"),
                    pch = NULL, col = 1:6, cex = NULL, bg = NA,
		    xlab = NULL, ylab = NULL, xlim = NULL, ylim = NULL,
		    ..., add = FALSE, verbose = getOption("verbose"))
{
    paste.ch <- function(chv) paste0('"',chv,'"', collapse=" ")
    str2vec <- function(string) {
	if(nchar(string, type="c")[1L] > 1L) strsplit(string[1L], NULL)[[1L]]
	else string
    }
    ## These from plot.default :
    xlabel <- if (!missing(x)) deparse(substitute(x))# else NULL
    ylabel <- if (!missing(y)) deparse(substitute(y))
    ##
    if(missing(x)) {
	if(missing(y)) stop("must specify at least one of 'x' and 'y'")
	else x <- seq_len(NROW(y))
    } else if(missing(y)) {
	y <- x;	 ylabel <- xlabel
	x <- seq_len(NROW(y)); xlabel <- ""
    }
    kx <- ncol(x <- as.matrix(x))
    ky <- ncol(y <- as.matrix(y))
    n <- nrow(x)
    if(n != nrow(y)) stop("'x' and 'y' must have same number of rows")

    if(kx > 1L && ky > 1L && kx != ky)
	stop("'x' and 'y' must have only 1 or the same number of columns")
    if(kx == 1L) x <- matrix(x, nrow = n, ncol = ky)
    if(ky == 1L) y <- matrix(y, nrow = n, ncol = kx)
    k <- max(kx, ky) ## k == kx == ky

    type <- str2vec(type)
    if(is.null(pch)) {
	pch <- c(1L:9L, 0L, letters, LETTERS)
	if(k > length(pch) && any(type %in% c("p","o","b")))
	    warning("default 'pch' is smaller than number of columns and hence recycled")
    } else if(is.character(pch)) pch <- str2vec(pch)
    ## else pch is numeric supposedly
    if(verbose)
	message("matplot: doing ", k, " plots with ",
		paste0(" col= (", paste.ch(col), ")"),
		paste0(" pch= (", paste.ch(pch), ")"),
		" ...\n", domain=NA)
    ii <- match("log", names(xargs <- list(...)), nomatch = 0L)
    log <- if (ii != 0) xargs[[ii]]
    xy <- xy.coords(x, y, xlabel, ylabel, log = log)
    xlab <- if (is.null(xlab)) xy$xlab else xlab
    ylab <- if (is.null(ylab)) xy$ylab else ylab
    xlim <- if (is.null(xlim)) range(xy$x[is.finite(xy$x)]) else xlim
    ylim <- if (is.null(ylim)) range(xy$y[is.finite(xy$y)]) else ylim
    if(length(type)< k) type <- rep_len(type,k)
    if(length(lty) < k) lty <- rep_len(lty, k)
    if(length(lend)< k) lend <- rep_len(lend, k)
    ## sciplot passes NULL
    if(length(lwd) < k && !is.null(lwd)) lwd <- rep_len(lwd, k)
    if(length(pch) < k) pch <- rep_len(pch, k)
    if(length(col) < k) col <- rep_len(col, k)
    if(length(bg) < k)	bg  <- rep_len(bg,  k)
    ## should not be able to call rep() on NULL
    if(is.null(cex)) cex <- 1
    if(length(cex) < k) cex <- rep_len(cex, k)
    ii <- seq_len(k)
    dev.hold(); on.exit(dev.flush())
    if(!add) {
	ii <- ii[-1L]
	plot(x[, 1L],y[, 1L], type = type[1L], xlab = xlab, ylab = ylab,
	     xlim  =  xlim, ylim  =  ylim, lty = lty[1L], lwd = lwd[1L],
             lend = lend[1L], pch = pch[1L], col = col[1L], cex = cex[1L],
             bg = bg[1L], ...)
    }
    for (i in ii)
	lines(x[,i], y[,i], type = type[i], lty = lty[i], lwd = lwd[i],
              lend = lend[i], pch = pch[i], col = col[i], cex = cex[i],
              bg = bg[i])
    invisible()
}