erp.xaxis: Draw an erp x axis

In erpR: Event-Related Potentials (ERP) Analysis, Graphics and Utility Functions

Description

This function plots an x axis for an erp waveform. Numbers and tick positions are determined according to three parameters: length.erp, startmsec and endmsec (the function calls msectopoints).

Usage

erp.xaxis(length.erp = NULL, startmsec=NULL, endmsec = NULL, 
x.tick = NULL, x.labels = x.tick, x.las=0,
draw.x.ticks = TRUE, x.pos = NA, x.outer = FALSE, x.font = NA, 
x.lty = "solid", x.lwd = 1,  x.lwd.ticks = 1, x.col = NULL,
x.col.ticks = NULL, x.hadj = NA,  x.padj = NA, x.tcl = -0.5,
x.tick.both= FALSE, x.cex = 1)

Arguments

length.erp	the length of the ERP vector the axis refers to.
startmsec	start time (in ms) of the ERP vector.
endmsec	end time (in ms) of the ERP vector.
x.tick	the position (in ms) of x ticks.
x.labels	the labels (usually a vector of numbers) to be plotted on the x axis.
x.las	the style of x axis labels.
draw.x.ticks	a logical value specifying whether x tickmarks and an axis line should be drawn.
x.pos	the position of x axis, in terms of y axis coordinates. Default is NA and the axis is drawn at the bottom of the plot.
x.outer	a logical value indicating whether the x axis should be drawn in the outer plot margin, rather than the standard plot margin.
x.font	font for text of x labels. Default is par("font").
x.lty	line type of both the x axis line and the x tick marks.
x.lwd	line width of the x axis line.
x.lwd.ticks	line width of the x tick marks.
x.col	colors of the x axis line and the x tick marks.
x.col.ticks	the color of the x tick marks (if specified, overrides x.col)
x.hadj	adjustment (see par("adj")) for all x labels parallel ("horizontal") to the reading direction. If this is not a finite value, the default is used (centering for strings parallel to the axis, alignment of the end nearest the axis otherwise).
x.padj	adjustment for each x tick label purpendicular to the reading direction. For labels parallel to the axes, padj = 0 means right or top alignment, and padj = 1 means left or bottom alignment. This can be a vector given a value for each string, and will be recycled as necessary.
x.tcl	The length of tick marks as a fraction of the height of a line of text. The default value is -0.5.
x.tick.both	Logical. Should the tick marks be drawn both above and below the x axis?
x.cex	The magnification to be used for the x labels.

Value

An erp x axis is drawn on an existing plot.

Note

This function is called internally by the erp function.

Author(s)

Giorgio Arcara

See Also

erp, erp.yaxis

Examples

plot(1, ylim=c(-5,5), xlim=c(0,200), frame.plot=FALSE, 
type="n", axes=FALSE, xlab="", ylab="")

erp.xaxis(200, startmsec=-200, endmsec=1500, 
x.pos=0, x.lwd=2)

erpR documentation built on June 7, 2019, 3 a.m.