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## snagged from: http://stackoverflow.com/questions/9680783/how-can-i-change-the-axis-position-for-pairs
# modified to include function for modifying X/Y values.
pairs3 <-
function (x, labels, XY_convert_fun = NULL, CustomColorFun = NULL, panel = points, ..., lower.panel = panel,
upper.panel = panel, diag.panel = NULL, text.panel = textPanel,
label.pos = 0.5 + has.diag/3, cex.labels = NULL, font.labels = 1,
row1attop = TRUE, gap = 1)
{
textPanel <- function(x = 0.5, y = 0.5, txt, cex, font) text(x,
y, txt, cex = cex, font = font)
localAxis <- function(side, x, y, xpd, bg, col = NULL, main,
oma, ...) {
if (side%%2 == 1)
Axis(x, side = side, xpd = NA, ...)
else Axis(y, side = side, xpd = NA, ...)
}
localPlot <- function(..., main, oma, font.main, cex.main) {
plot(...)
}
localLowerPanel <- function(..., main, oma, font.main, cex.main) lower.panel(...)
localUpperPanel <- function(..., main, oma, font.main, cex.main) upper.panel(...)
localDiagPanel <- function(..., main, oma, font.main, cex.main) diag.panel(...)
dots <- list(...)
nmdots <- names(dots)
if (!is.matrix(x)) {
x <- as.data.frame(x)
for (i in seq_along(names(x))) {
if (is.factor(x[[i]]) || is.logical(x[[i]]))
x[[i]] <- as.numeric(x[[i]])
if (!is.numeric(unclass(x[[i]])))
stop("non-numeric argument to 'pairs'")
}
}
else if (!is.numeric(x))
stop("non-numeric argument to 'pairs'")
panel <- match.fun(panel)
if ((has.lower <- !is.null(lower.panel)) && !missing(lower.panel))
lower.panel <- match.fun(lower.panel)
if ((has.upper <- !is.null(upper.panel)) && !missing(upper.panel))
upper.panel <- match.fun(upper.panel)
if ((has.diag <- !is.null(diag.panel)) && !missing(diag.panel))
diag.panel <- match.fun(diag.panel)
if (row1attop) {
tmp <- lower.panel
lower.panel <- upper.panel
upper.panel <- tmp
tmp <- has.lower
has.lower <- has.upper
has.upper <- tmp
}
nc <- ncol(x)
if (nc < 2)
stop("only one column in the argument to 'pairs'")
has.labs <- TRUE
if (missing(labels)) {
labels <- colnames(x)
if (is.null(labels))
labels <- paste("var", 1L:nc)
}
else if (is.null(labels))
has.labs <- FALSE
oma <- if ("oma" %in% nmdots)
dots$oma
else NULL
main <- if ("main" %in% nmdots)
dots$main
else NULL
if (is.null(oma)) {
oma <- c(4, 4, 4, 4)
if (!is.null(main))
oma[3L] <- 6
}
opar <- par(mfrow = c(nc, nc), mar = rep.int(gap/2, 4), oma = oma)
on.exit(par(opar))
dev.hold()
on.exit(dev.flush(), add = TRUE)
for (i in if (row1attop)
1L:nc
else nc:1L) for (j in 1L:nc) {
#print(paste(i,"vs", j));
xvals = x[,j]
yvals = x[,i]
if ( (i != j) && ! is.null(XY_convert_fun)) {
res = XY_convert_fun(xvals, yvals);
xvals = res[['x']]
yvals = res[['y']]
}
col='black' # default
if (! is.null(CustomColorFun))
col=CustomColorFun(xvals,yvals)
# get_list_from_ellipsis2 <- function(...) as.list(substitute(list(...)))[-1L]
# print(get_list_from_ellipsis2(...));stop();
localPlot(xvals, yvals, xlab = "", ylab = "",axes = F, #col=ifelse(abs(xvals-yvals)>2, 'red', 'black'),
type = "n", ...)
if (i == j || (i < j && has.lower) || (i > j && has.upper)) {
box()
# edited here...
# if (i == 1 && (!(j%%2) || !has.upper || !has.lower))
# localAxis(1 + 2 * row1attop, x[, j], x[, i],
# ...)
# draw x-axis
if (i != j) #(i == nc & j != nc)
localAxis(1, xvals, yvals,
...)
# draw y-axis
if (j != i) #(j == 1 & i != 1)
localAxis(2, xvals, yvals, ...)
# if (j == nc && (i%%2 || !has.upper || !has.lower))
# localAxis(4, x[, j], x[, i], ...)
mfg <- par("mfg")
if (i == j) {
if (has.diag)
localDiagPanel(as.vector(yvals), ...)
if (has.labs) {
par(usr = c(0, 1, 0, 1))
if (is.null(cex.labels)) {
l.wid <- strwidth(labels, "user")
cex.labels <- max(0.8, min(2, 0.9/max(l.wid)))
}
text.panel(0.5, label.pos, labels[i], cex = cex.labels,
font = font.labels)
}
}
else if (i < j)
localLowerPanel(as.vector(xvals), as.vector(yvals), col=col, ...)
else localUpperPanel(as.vector(xvals), as.vector(yvals), col=col, ...)
if (any(par("mfg") != mfg))
stop("the 'panel' function made a new plot")
}
else par(new = FALSE)
}
if (!is.null(main)) {
font.main <- if ("font.main" %in% nmdots)
dots$font.main
else par("font.main")
cex.main <- if ("cex.main" %in% nmdots)
dots$cex.main
else par("cex.main")
mtext(main, 3, 3, TRUE, 0.5, cex = cex.main, font = font.main)
}
invisible(NULL)
}
## Demo it:
demo_pairs3 = function (custom_fun=F) {
data(iris)
xy_conv = function(x,y) {
res = list();
res[['x']] = (x+y)/2;
res[['y']] = x - y;
return(res);
}
if (custom_fun) {
pairs3(iris[1:4], XY_convert_fun = xy_conv, main = "Anderson's Iris Data -- 3 species",pch = 21, bg = c("red", "green3", "blue")[unclass(iris$Species)])
}
else {
pairs3(iris[1:4], main = "Anderson's Iris Data -- 3 species",pch = 21, bg = c("red", "green3", "blue")[unclass(iris$Species)])
}
}
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