R : Copyright 2004, The R Foundation for Statistical Computing
Version 1.9.0 Patched (2004-05-12), ISBN 3-900051-00-3

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> #### Regression tests for GRAPHICS & PLOTS
> 
> postscript("reg-plot.ps", paper="a4", horizontal=TRUE,
+            encoding ="ISOLatin1.enc")
> ## since we supply the font metrics, the results depend only on
> ## the encoding used: Windows is different from Unix by default.
> 
> options(warn = 1)# print them as they occur
> 
> plot(0) # this should remain constant
> str(par(c("usr","xaxp","yaxp")))
List of 3
 $ usr : num [1:4]  0.568  1.432 -1.080  1.080
 $ xaxp: num [1:3] 0.6 1.4 4.0
 $ yaxp: num [1:3] -1 1 4
> 
> 
> 
> ### Test for centring of chars.  All the chars which are plotted should
> ### be centred, and there should be no warnings about
> ### font metrics unknown for character `?'
> 
> par(pty="s")
> plot(c(-1,16), c(-1,16), type="n", xlab="", ylab="", xaxs="i", yaxs="i")
> title("Centred chars in default char set (ISO Latin1)")
> grid(17, 17, lty=1)
> known <- c(32:126, 144:152, 154, 155, 157:255)
> 
> for(i in known) {
+     x <- i %% 16
+     y <- i %/% 16
+     points(x, y, pch=i)
+ }
> 
> par(pty="m")
> 
> ## PR 816 (label sizes in dotchart)
> 
> ### Prior to 1.2.2, the label sizes were unaffected by cex.
> 
> data(VADeaths)
> dotchart(VADeaths, main = "Death Rates in Virginia - 1940", cex = 0.5)
> dotchart(VADeaths, main = "Death Rates in Virginia - 1940", cex = 1.5)
> 
> ## killed by 0 prior to 1.4.0 and in 1.4.1:
> t1 <- ts(0:100)
> ## only warnings about values <= 0
> plot(t1, log = "y")
Warning in xy.coords(x, NULL, log = log) : 1 y value <= 0 omitted from logarithmic plot
> plot(cbind(t1, 10*t1, t1 - 4), log="y", plot.type = "single")
Warning in xy.coords(x = matrix(rep.int(tx, k), ncol = k), y = x, log = log) : 
	 7 y values <= 0 omitted from logarithmic plot
> stopifnot(par("usr")[4] > 3) # log10: ylim[2] = 1000
> 
> 
> ## This one needs to be looked at.
> ## lty = "blank" killed the fill colour too.
> plot(1:10, type="n")
> polygon(c(1, 3, 3, 1), c(1, 1, 3, 3), col="yellow", border="red", lty="blank")
> rect(6, 6, 10, 10,  col="blue", border="red", lty="blank")
> ## in 1.5.0 all omit the fill colours.
> data(trees)
> with(trees, symbols(Height, Volume, circles=Girth/24, inches=FALSE,
+                     lty="blank", bg="blue"))
> ## in 1.5.0 ignored the lty.
> 
> ## axis() and par(mgp < 0) {keep this example S+ compatible!}:
> lt <- if(is.R()) "31" else 2
> x <- seq(-2,3, len=1001)
> op <- par(tck= +0.02, mgp = -c(3,2,0))
> plot(x, x^2 - 1.2, xaxt = "n", xlab="", type ='l', col = 2,
+      main = "mgp < 0: all ticks and labels inside `frame'")
> x <- -2:3
> lines(x, x^2 - 1.2, type ="h", col = 3, lwd=3)
> axis(1, pos = 0, at=-1:1, lty = lt, col=4)## col & lty work only from R 1.6
> par(op)
> axis(1, pos = 0, at=c(-2,2,3), lty = lt, col=4)
> mtext(side=1,"note the x-ticks on the other side of the bars")
> 
> ## plot.table(): explicit xlab and ylab for non-1D
> data(UCBAdmissions)
> plot(UCBAdmissions)# default x- and y-lab
> plot(UCBAdmissions, xlab = "x label", ylab = "YY")# wrong in 1.5.1
> ##   axis suppression
> plot(tt <- table(c(rep(0,7), rep(1,4), rep(5, 3))), axes = FALSE)
> plot(tt, xaxt = "n")
> ## wrong till (incl.) 1.6.x
> 
> ## legend with call
> lo <- legend(2,2, substitute(hat(theta) == that, list(that= pi)))
> stopifnot(length(lo$text$x) == 1)
> ## length() was 3 till 1.7.x
> 
> plot(ecdf(c(1:4,8,12)), ylab = "ECDF", main=NULL)
> ## ylab didn't work till 1.8.0
> 
> plot(1:10, pch = NA) # gave error till 1.9.0
> points(1:3, pch=c("o",NA,"x"))# used "N"
> try(points(4, pch=c(NA,FALSE)))# still give an error
Error in plot.xy(xy.coords(x, y), type = type, pch = pch, col = col, bg = bg,  : 
	only NA allowed in logical plotting symbol
>