units {graphics}

R Documentation

Graphical Units

Description

xinch and yinch convert the specified number of inches given as their arguments into the correct units for plotting with graphics functions. Usually, this only makes sense when normal coordinates are used, i.e., no log scale (see the log argument to par).

xyinch does the same for a pair of numbers xy, simultaneously.

Usage

xinch(x = 1, warn.log = TRUE)
yinch(y = 1, warn.log = TRUE)
xyinch(xy = 1, warn.log = TRUE)

Arguments

x, y	numeric vector
xy	numeric of length 1 or 2.
warn.log	logical; if TRUE, a warning is printed in case of active log scale.

Examples

all(c(xinch(), yinch()) == xyinch()) # TRUE
xyinch()
xyinch #- to see that is really   delta{"usr"} / "pin"

## plot labels offset 0.12 inches to the right
## of plotted symbols in a plot
with(mtcars, {
    plot(mpg, disp, pch = 19, main = "Motor Trend Cars")
    text(mpg + xinch(0.12), disp, row.names(mtcars),
         adj = 0, cex = .7, col = "blue")
    })

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