legend: internal functions for setting useful defaults for graphs
In PerformanceAnalytics: Econometric Tools for Performance and Risk Analysis

Description Usage Arguments Details See Also

Internal functions and data objects to make graphs easier to read, and better for print and presentation.

legend(
  x,
  y = NULL,
  legend,
  fill = NULL,
  col = par("col"),
  lty,
  lwd,
  pch,
  angle = 45,
  density = NULL,
  bty = "o",
  bg = par("bg"),
  pt.bg = NA,
  cex = 1,
  pt.cex = cex,
  pt.lwd = lwd,
  xjust = 0,
  yjust = 1,
  x.intersp = 1,
  y.intersp = 1,
  adj = c(0, 0.5),
  text.width = NULL,
  text.col = par("col"),
  merge = do.lines && has.pch,
  trace = FALSE,
  plot = TRUE,
  ncol = 1,
  horiz = FALSE,
  title = NULL,
  inset = 0,
  border.col = NULL,
  border.lwd = 1,
  border.lty = "solid",
  box.col = NULL,
  box.lwd = 1,
  box.lty = "solid",
  ...
)

`x, y`	the x and y co-ordinates to be used to position the legend. They can be specified by keyword or in any way which is accepted by `xy.coords`: See Details.
`legend`	a character or expression vector. of length >= 1 to appear in the legend.
`fill`	if specified, this argument will cause boxes filled with the specified colors (or shaded in the specified colors) to appear beside the legend text.
`col`	the color of points or lines appearing in the legend.
`lty, lwd`	the line types and widths for lines appearing in the legend. One of these two must be specified for line drawing.
`pch`	the plotting symbols appearing in the legend, either as vector of 1-character strings, or one (multi character) string. Must be specified for symbol drawing.
`angle`	angle of shading lines.
`density`	the density of shading lines, if numeric and positive. If `NULL` or negative or `NA` color filling is assumed.
`bty`	the type of box to be drawn around the legend. The allowed values are `"o"` (the default) and `"n"`.
`bg`	the background color for the legend box. (Note that this is only used if `bty != "n"`.)
`pt.bg`	the background color for the `points`, corresponding to its argument `bg`.
`cex`	character expansion factor relative to current `par("cex")`.
`pt.cex`	expansion factor(s) for the points.
`pt.lwd`	line width for the points, defaults to the one for lines, or if that is not set, to `par("lwd")`.
`xjust`	how the legend is to be justified relative to the legend x location. A value of 0 means left justified, 0.5 means centered and 1 means right justified.
`yjust`	the same as `xjust` for the legend y location.
`x.intersp`	character interspacing factor for horizontal (x) spacing.
`y.intersp`	the same for vertical (y) line distances.
`adj`	numeric of length 1 or 2; the string adjustment for legend text. Useful for y-adjustment when `labels` are plotmath expressions.
`text.width`	the width of the legend text in x (`"user"`) coordinates. (Should be positive even for a reversed x axis.) Defaults to the proper value computed by `strwidth(legend)`.
`text.col`	the color used for the legend text.
`merge`	logical; if `TRUE`, “merge” points and lines but not filled boxes. Defaults to `TRUE` if there are points and lines.
`trace`	logical; if `TRUE`, shows how `legend` does all its magical computations.
`plot`	logical. If `FALSE`, nothing is plotted but the sizes are returned.
`ncol`	the number of columns in which to set the legend items (default is 1, a vertical legend).
`horiz`	logical; if `TRUE`, set the legend horizontally rather than vertically (specifying `horiz` overrides the `ncol` specification).
`title`	a character string or length-one expression giving a title to be placed at the top of the legend.
`inset`	inset distance(s) from the margins as a fraction of the plot region when legend is placed by keyword.
`border.lty, border.lwd`	the line type and width for the legend border.
`box.lty, box.lwd`	the line type and width for the legend box.
`...`	any other passthrough parameters