logAxis: Add a pretty log axis to a plot

In sherrillmix/dnar: Miscellaneous functions to deal with bioinformatic analyses

Add a pretty log axis to a plot

Description

Adds a log axis to the current plot with log='x' or log='y' with ticks and labels specified with powers of 10

Usage

logAxis(
  side = 2,
  exponent = TRUE,
  addExtra = !exponent,
  minorTcl = -0.2,
  axisMin = -Inf,
  axisMax = Inf,
  offset = 0,
  col.ticks = "black",
  axisVals = NULL,
  ...
)

Arguments

side	an integer specifying which side of the plot the axis is to be drawn on. The axis is placed as follows: 1=below, 2=left, 3=above and 4=right.
exponent	If true label sides using exponents of 10. Otherwise just use normal numbers
addExtra	If true add additional labels at 5 or 2 if there are few labels
minorTcl	Length of the minor unlabelled ticks. NA to suppress
axisMin	The minimum to extend ticks to
axisMax	The maximum to extend ticks to
offset	An integer giving the amount to offset labels from their true position. For example, offset=1 if the plotted data was generated by adding to 1 to avoid 0s in the original data.
col.ticks	colors for the tick marks
axisVals	log10 values to be displayed on y axis (instead of autogenerated)
...	Additional arguments to axis

Value

An invisible list containing the minor and major axis label positions

Examples

plot(1:1000,log='xy',xaxt='n',yaxt='n')
logAxis(las=1)
logAxis(1,exponent=FALSE)

sherrillmix/dnar documentation built on July 18, 2022, 10:07 p.m.