addGrid: Add grid lines to an existing plot.
Description
This function adds horizontal and/or vertical grid lines to an existing plot. The grid lines are
aligned with tick marks.
Usage
addGrid(
linesPerTick = NULL,
linesPerTick.horiz = linesPerTick,
linesPerTick.vert = linesPerTick,
horiz = TRUE,
vert = FALSE,
col = "grey30",
lty = 3)
Arguments
- linesPerTick
Number of lines between successive tick marks (including the line on the
tickmarks themselves).
- linesPerTick.horiz
Number of horizontal lines between successive tick marks (including the line on the
tickmarks themselves).
- linesPerTick.vert
Number of vertical lines between successive tick marks (including the line on the
tickmarks themselves).
- horiz
Draw horizontal grid lines?
- vert
Draw vertical tick lines?
- col
Specifies color of the grid lines
- lty
Specifies line type of grid lines. See par
.
Details
If linesPerTick
is not specified, it is set to 5 if number of tick s is 5 or less, and it
is set to 2 if number of ticks is greater than 5.
Examples
Run this code plot(c(1:10), c(1:10))
addGrid();
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