minor.tick: Minor Tick Marks

Description

Adds minor tick marks to an existing plot. All minor tick marks that will fit on the axes will be drawn.

Usage

minor.tick(nx=2, ny=2, tick.ratio=0.5, x.args = list(), y.args = list())

Arguments

nx: number of intervals in which to divide the area between major tick marks on the X-axis. Set to 1 to suppress minor tick marks.
ny: same as nx but for the Y-axis.
tick.ratio: ratio of lengths of minor tick marks to major tick marks. The length of major tick marks is retrieved from par("tck").
x.args: additionl arguments (e.g. post, lwd) used by axis() function when rendering the X-axis.
y.args: same as x.args but for Y-axis.

Side Effects

plots

Author

Frank Harrell
Department of Biostatistics
Vanderbilt University
fh@fharrell.com
Earl Bellinger
Max Planck Institute
earlbellinger@gmail.com
Viktor Horvath
Brandeis University
vhorvath@brandeis.edu

Examples

Run this code

# Plot with default settings
plot(runif(20), runif(20))
minor.tick()

# Plot with arguments passed to axis()
plot(c(0,1), c(0,1), type = 'n', axes = FALSE, ann = FALSE)
# setting up a plot without axes and annotation
points(runif(20), runif(20))                       # plotting data
axis(1, pos = 0.5, lwd = 2)                        # showing X-axis at Y = 0.5 with formatting
axis(2, col = 2)                                   # formatted Y-axis
minor.tick( nx = 4, ny = 4, tick.ratio = 0.3,
            x.args = list(pos = 0.5, lwd = 2),     # X-minor tick format argumnets
            y.args = list(col = 2))                # Y-minor tick format arguments