sfsmisc (version 1.0-0)

eaxis: Extended / Engineering Axis for Graphics

Description

An extended axis() function which labels more prettily, in particular for log-scale axes.

It makes use of plotmath expressions of the form $k \times 10^k$ for labeling a log-scaled axis and when otherwise exponentional formatting would be used.

Usage

eaxis(side, at = axTicks(side, log=log), labels = NULL, log = NULL,
      f.smalltcl = 3/5, at.small = NULL, small.mult = NULL,
      outer.at = TRUE, drop.1 = TRUE)

Arguments

side

integer in 1:4, specifying side of axis.

at

numeric vector of (normalsized) tick locations; by default axTicks(side), i.e., the same as axis() would use.

labels

NULL (default), logical, character or expression, as in axis(); in addition, if NA, labels = T

log

logical or NULL specifying if log-scale should be used; the default depends on the current plot's axis.

f.smalltcl

factor specifying the lengths of the small ticks in proportion to the normalsized, labeled ticks.

at.small

locations of small ticks; default uses used as small ticks.

small.mult

which multiples of axTicks() should be used as small ticks by default.

outer.at

logical specifying that at.small should also be constructed outside the at range, but still inside the corresponding par("usr").

drop.1

logical specifying if "1 *" should be dropped from labels, passed to pretty10exp().

See Also

axis, axTicks, axTexpr, pretty10exp.

Examples

x <- lseq(1e-10, 0.1, length = 201)
plot(x, pt(x, df=3), type = "l", xaxt = "n", log = "x")
eaxis(1)

## If you like the ticks, but prefer traditional (non-"plotmath") labels:
plot(x,  gamma(x),   type = "l", log = "x")
eaxis(1, labels=NA)

x <- lseq(.001, 0.1, length = 1000)
plot(x, sin(1/x)*x, type = "l", xaxt = "n", log = "x")
eaxis(1)

## non- log-scale : draw small ticks, but no "10^k" if not needed:
x <- seq(-100, 100, length = 1000)
plot(x, sin(x)/x, type = "l", xaxt = "n")
eaxis(1)

x <- seq(-1, 1, length = 1000)
plot(x, sin(x)/x, type = "l", xaxt = "n")
eaxis(1)

x <- x/1000
plot(x, 1-sin(x)/x, type = "l", xaxt = "n", yaxt = "n")
eaxis(1)
eaxis(2)
## more labels than default:
op <- par(lab=c(10,5,7))
plot(x, sin(x)/x, type = "l", xaxt = "n")
eaxis(1) # maybe (depending on your canvas), there are too many,
## in that case, maybe use
plot(x, sin(x)/x, type = "l", xaxt = "n")
eaxis(1, axTicks(1)[c(TRUE,FALSE)]) # drop every 2nd label
eaxis(3, labels=FALSE)
par(op)