The R Project SVN R

#### Regression tests for GRAPHICS & PLOTS -- requiring strict PDF equality

pdf("reg-plot.pdf", paper="a4r", encoding ="ISOLatin1.enc", compress = FALSE,

    useDingbats = TRUE)

## 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")))

stopifnot(all.equal(

    par(c("usr","xaxp","yaxp"))

   ,

    list(usr = c(0.568, 1.432, -1.08, 1.08),

         xaxp = c(0.6, 1.4, 4), yaxp = c(-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")

plot(cbind(t1, 10*t1, t1 - 4), log="y", plot.type = "single")

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)

lt <-"31" # in R

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

## '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 rounding 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")

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))

## 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]

## axis.Date() and axis.POSIXct() with reversed 'xlim'

toD <- as.Date("2016-08-19"); dates <- c(toD - 10, toD)

plot(dates, 1:2, xlim = rev(dates),

     ann=FALSE, yaxt="n", frame.plot=FALSE)

## failed to label the dates in R <= 3.3.1

## axis.Date() with various data types:

x <- seq(as.Date("2022-01-20"), as.Date("2023-03-21"), by = "days")

plot(data.frame(x, y = 1), xaxt = "n")

axis.Date(1)

axis.Date(3, at = "2022-04-01")

axis.Date(3, at = as.Date("2022-07-01"))

axis.Date(3, at = as.POSIXct(as.Date("2022-10-01")))

axis.Date(3, at = as.POSIXlt(as.Date("2023-01-01")))

axis.Date(3, at = as.integer(as.Date("2023-04-01")))

## automatically extends the format:

axis.Date(1, at = "2022-02-15", tck = -0.05, mgp = c(3,2,0))

## axis.POSIXct() with various data types (2 minutes)

x <- as.POSIXct("2022-10-01") + c(0, 60, 120)

plot(data.frame(x, y = 1), xaxt="n")

axis.POSIXct(1)

axis.POSIXct(3, at = "2022-10-01 00:01")

axis.POSIXct(3, at = as.Date("2022-10-01"))

axis.POSIXct(3, at = as.POSIXct("2022-10-01 00:01:30"))

axis.POSIXct(3, at = as.POSIXlt("2022-10-01 00:02"))

axis.POSIXct(3, at = as.numeric(as.POSIXct("2022-10-01 00:00:30")))

## automatically extends format (here: subseconds):

axis.POSIXct(3, at = "2022-10-01 00:00:30.25", mgp = c(3,2,0))

## axis.POSIXct: a few days, extending the format

days <- seq(as.Date("2022-10-01"), as.Date("2022-12-21"), by="days")

x <- as.POSIXct(as.character(days))

plot(data.frame(x = range(x), y = 1), xaxt="n")

axis.POSIXct(1, x)

axis.POSIXct(1, x, at = as.Date("2022-10-12"), mgp = c(3,2,0), tck = -0.04)

axis.POSIXct(3, x, at = as.POSIXct("2022-10-15"))

axis.POSIXct(3, x, at = as.POSIXlt("2022-10-15"), mgp = c(3,2,0))

axis.POSIXct(1, x, at = "2022-11-01 23:00", mgp = c(3,2,0), tck = -0.04)

axis.POSIXct(3, x, at = "2022-11-01 06:00")

axis.POSIXct(3, x, at = as.numeric(as.POSIXct("2022-12-01")))

## axis() -- labels only written when there's room

plot2 <- function(at, wait=FALSE) {

    plot1 <- function(x,y) plot(x,y, type="n", xlab="", ylab="", tck=0, frame.plot=FALSE)

    plot1( at, at); axis(3, at= at, tck=0)

    plot1(-at,-at); axis(3, at=-at, tck=0)

    if(wait) { mtext("Click here to advance!", line=-2, cex=1.5, col=2); locator(1) }

}

at <- c(7:15, 2*(8:15), 5*(7:15), 10*(8:15))

op <- par(mfrow=2:1, mgp = c(1.5, 0.6, 0), mar = .1+c(2,2,2,1),

          lab = c(20,20,7), las = 1) # las=1: all horizontal => y-axis perpendicular

interAct <- dev.interactive()

if(interAct) { xMar <- c(1,3)/2  ; nP <- 10

} else {       xMar <- c(1,3)*3/2; nP <-  3 }

## Now increasing margins ==> decreasing plot area ==> shrinking plot

## (*is* device dependent [here have "a4r"-pdf]) :

for(n in 1:nP) {

    par(mar = par("mar") + xMar)

    plot2(at, n < nP && interAct)

}

par(op)

##----- pairs() using verInd & horInd ----------

mpairs <- function(..., p=3, npp=2, main) { # p=4, npp=7 was Chris Andrews' example

    x <- matrix((1:(p*npp))/npp, ncol=p, dimnames=list(NULL, paste0("x", 1:p)))

    ## -> x \in [1/npp,.., p]  <==> ceiling(x) \in {1,2,...,p}

    ## the panel function

    mP <- function(x,y, ...) { ## really made for the 'x = ...' above

        j <- ceiling(mean(y)) # in 1:p

        points(x,y, col=ceiling(mean(x)), pch= 3*j, cex=((p-1.5)*j+1)/p, ...)

        g <- 1:(p-1); abline(h=g, v=g, lty=3, col="gray33")

    }

    if(missing(main))

        main <- if(...length()) sub("mpairs", '', deparse(sys.call()))

    lim <- range(x)

    k <- max(2, npp-2) ## bug in R(?): par(lab = c(1,1,7)) giving nonsense!

    op <- par(lab = c(k,k,7), oma=c(1,0,0,0)); on.exit(par(op))

    pairs(x, panel=mP, xlim=lim, ylim=lim, main=main, cex.main=1, ...)

}

mpairs() # 4x4 matrix of scatterplots

if(interAct) dev.set(if(length(dev.list()) < 2) dev.new() else dev.prev())

mpairs(horInd=1:2,verInd=  1:3 ) # 3x2 matrix: upper left [WRONG in R <= 3.5.0]

mpairs(horInd=3:2)               # 2x4: middle rows swapped

mpairs(           verInd=c(3,1)) # 4x2: cols 3,1

##

## now all with  'row1attop=FALSE'=======

if(interAct) dev.set(dev.prev())

mpairs(row1attop=FALSE) # 4x4 matrix of scatterplots -- perfect in R <= 3.5.0

if(interAct) dev.set(dev.next())

## a version of those above, with 'row1attop = FALSE'

mpairs(horInd=2:1,verInd=3:1   , row1attop=FALSE) # 3x2: *swapped* upper left

mpairs(horInd=c(3,1)           , row1attop=FALSE) # 2x3: swapped outer rows

mpairs(           verInd=c(3,2), row1attop=FALSE) # 3x2: cols 3,2

## axis() when in subnormal range (x is subnormal if 0 < x < .Machine$double.xmin):

(.min.exp.subnormal <- with(.Machine, double.min.exp + double.ulp.digits)) # -1074

(ry <- range(y74 <- 2^(.min.exp.subnormal + 0:50))) # all subnormal

plotNchk <- function(y) {

    plot(y, log = "y", xlab="", ylab="", xaxt="n") # (as small pdf as possible)

    ry <- range(y)

    xp <- par("yaxp")

    ## and indeed yaxp do cover the range(y) :

    stopifnot(xp[1] <= ry[1], ry[2] <= xp[2], xp[3] == 1)

    invisible(xp)

}

if(interactive()) # not regularly, where pdf is stored

plotNchk(y74) # gives 3 warnings; 1. from pretty(): "very small range"

plotNchk(y74[1:8]) # 3 warnings *and* no error anymore

plotNchk(y74[1:2]) #    (ditto)

## dotchart(*, pch=., groups=*) -- PR#16953

## dotchart(*, ylab=.) for groups;

g <- rep(1:3, each=2)

dotchart(VADeaths[1:2, 1:3], color=g, pch=g,

         ylab = "Grouping:  {Urbanity . Gender} x Age",

         xaxt="n", frame.plot=FALSE)

## now pch and colors match groups;

## ylab placement; group (row) labels show again

## non-integer mgp[3] -- PR#18194

par(mar = c(5, 5, 5, 5))

plot.new()

plot.window(xlim = c(0, 5), ylim = 0:1)

if(dev.interactive()) {

    box(lty = 3)

    ## 'axis' puts line and labels in right place when 'mgp[3]' is integer

    mgp_bottom <- c(4, 2.5, 1) # 'mgp[1]' is arbitrary

    axis(1, at=c(1,4), mgp = mgp_bottom)

    mtext(c("labels", "line"), side = 1, line = mgp_bottom[2:3])

}

## Now, 'axis' puts line & labels in right place also when 'mgp[3]' is noninteger:

mgp_top <- c(4, 2.5, 0.9)

axis(3, at=c(1,4), mgp = mgp_top)

mtext(c("labels are here", "line"), line = mgp_top[2:3])

## They were one line too high in R <= 4.1.1