Draw a single axis, optionally at an explicit position

tda_pl_axes draws both axes together, at the plot's boundary. tda_pl_axis draws one axis at a time and, via at, can place it anywhere in the plot rather than only at the boundary – TDA's technique for a second x or y axis (e.g. a top axis in different units from the bottom one), which tda_pl_axes alone cannot reach.

Usage

tda_pl_axis(
  p,
  which = c("x", "y"),
  sc = NULL,
  ic = NULL,
  lty = NULL,
  lw = NULL,
  fs = NULL,
  tl = NULL,
  fmt = NULL,
  at = NULL,
  dir = NULL,
  ...
)

Arguments

p

a tda_ps session.

which

"x" or "y", which axis to draw.

sc, ic, lty, lw, fs, tl, fmt

as in tda_pl_axes, for this one axis.

at

the axis line's endpoints, c(xa, ya, xb, yb) in data units, when it is not simply the plot's boundary (TDA's plxa(...) = xa,ya,xb,yb right-hand side). Omit for an ordinary axis at the plot boundary.

dir

which side of the axis line the tick labels are written on (TDA's dir=); only meaningful together with at.

...

further options for plxa/plya.

Value

The session, with the command added.

See also

Other plotting: plot.tda_ple(), tda_check_ps(), tda_pl(), tda_pl_arc(), tda_pl_graph(), tda_pl_hist, tda_pl_panel(), tda_pl_regression(), tda_pl_scatter(), tda_plot_ps(), tda_ps(), tda_ps3(), tda_read_ps()

Examples

p <- tda_ps(xlim = c(-2, 2), ylim = c(0, 1))
p <- tda_pl_axis(p, "x", sc = 1, ic = 2)
p <- tda_pl_axis(p, "y", sc = 0.5, ic = 0)
# a second x axis, drawn at y = 1 instead of the plot's bottom edge
p <- tda_pl_axis(p, "x", sc = 1, ic = 5, dir = 1, at = c(-1, 1, 1, 1))