R version 3.3.0 beta (2016-04-19 r70517) -- "Supposedly Educational"
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> #### Regression tests for GRAPHICS & PLOTS
> 
> pdf("reg-plot.pdf", paper="a4r", encoding ="ISOLatin1.enc", compress = FALSE)
> 
> ## 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 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 -1.08 1.08
 $ xaxp: num [1:3] 0.6 1.4 4
 $ 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, 160:255)
> 
> 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.
> 
> 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.
> 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
> 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, ...) : 
  only NA allowed in logical plotting symbol
> 
> ## 'lwd' should transfer to plot symbols
> legend(1,10, c("A","bcd"), lwd = 2:3, pch= 21:22, pt.bg="skyblue",
+        col = 2:3, bg = "thistle")
> ## (gave an error for 2 days in "2.0.0 unstable")
> 
> x <- 2^seq(1,1001, length=20)
> plot(x, x^0.9, type="l", log="xy")
> ## gave error 'Infinite axis extents [GEPretty(1.87013e-12,inf,5)]' for R 2.0.1
> 
> plot(as.Date("2001/1/1") + 12*(1:9), 1:9)
> ## used bad 'xlab/ylab' in some versions of R 2.2.0(unstable)
> 
> ## dotchart() restoring par()
> Opar <- par(no.readonly=TRUE) ; dotchart(1:4, cex= 0.7)
> Npar <- par(no.readonly=TRUE)
> ii <- c(37, 50:51, 58:59, 63)
> stopifnot(identical(names(Opar)[ii],
+                     c("mai","pin","plt","usr","xaxp","yaxp")),
+           identical(Opar[-ii], Npar[-ii]))
> ## did not correctly restore par("mar") up to (incl) R 2.4.0
> 
> ## plot.function()     [n=11, ... : since we store and diff PS file !]
> plot(cos,       xlim=c(-5,5), n=11, axes=FALSE); abline(v=0)
> ## did *not* plot for negative x up to R 2.5.1
> plot(sin, -2,3, xlim=c(-5,5), n=11, axes=FALSE, xlab="")# plot from -2
> axis(1, at=c(-2,3), tcl=-1); axis(1, at=c(-5,5))
> ## (from,to) & xlim  should work simultaneously
> 
> plot(cos, -7,7, n=11, axes=FALSE)
> ## gave wrong ylab in R 2.6.0
> plot(cos, -7,7, ylab = "Cosine  cos(x)", n=11, axes=FALSE)
> ## partial matching of 'ylab'; mapping  [0,1] (not [-7.7]):
> ## margins chosen to avoid rouding error showing to 2dp.
> op <- par(mar=c(5,4.123,4,2)+0.1)
> plot(gamma, yla = expression(Gamma(x)), n=11, yaxt="n")
Warning in x(x) : NaNs produced
> par(op)
> 
> ## plot.ts(x, y) could get the labels wrong in R <= 2.6.0:
> x <- ts(1:5);x1 <- lag(x, 2); plot(x1, x, axes=FALSE)
> 
> # adding a curve in log scale :
> curve(5*exp(-x), 0.1, 100, n = 3, log="x", ylab="", axes=FALSE)
> curve(5*exp(-x), add=TRUE, n = 3, col=2,lwd=3)
> ## should fully overplot; wrong default xlim in 2.6.1
> ## (and *slightly* wrong up to 2.6.0)
> 
> ## Axis() calls via plot()  {[xy]axt to keep *.ps small}
> x <- as.Date("2008-04-22 09:45") + (i <- c(0,4))
> plot(x,    xaxt="n")# not ok in 2.6.2, nor 2.7.0
> plot(x, i, yaxt="n")# ok in 2.6.2  and 2.7.0
> plot(i, x, xaxt="n")# ok in 2.6.2 and not in 2.7.0
> 
> ## table methods should be bypassed:
> dotchart(table(infert$education))
Warning in dotchart(table(infert$education)) :
  'x' is neither a vector nor a matrix: using as.numeric(x)
> ## failed in 2.12.[12]
> 
> ## cex as "..."  in "high level" function
> hc <- hclust(dst <- dist(c(1:2, 5)), method="ave")
> plot(hc, cex = 2, axes=FALSE, ann=FALSE)
> ## cex was not used in 3.0.[01]
> 
>