cf_grid: Create a contour plot from a grid of data

In ContourFunctions: Create Contour Plots from Data or a Function

Create a contour plot from a grid of data

Description

Makes filled contour plot with an optional sidebar, essentially filled.contour function. This version uses the split.screen() function to add the sidebar if bar is TRUE. By default it won't show the bar but will show the min and max values in the plot title along with their colors. Using this function will make other functions such as points() called afterwards not put points where you expect. Pass anything you want added to the plot area to afterplotfunc as a function to get it to work properly.

Usage

cf_grid(
  x = seq(0, 1, length.out = nrow(z)),
  y = seq(0, 1, length.out = ncol(z)),
  z,
  xlim = range(x, finite = TRUE),
  ylim = range(y, finite = TRUE),
  zlim = range(z, finite = TRUE),
  levels = pretty(zlim, nlevels),
  nlevels = 20,
  color.palette = cm.colors.strong,
  col = color.palette(length(levels) - 1),
  plot.title,
  plot.axes,
  key.title,
  key.axes,
  asp = NA,
  xaxs = "i",
  yaxs = "i",
  las = 1,
  axes = TRUE,
  frame.plot = axes,
  bar = F,
  pts = NULL,
  reset.par = TRUE,
  pretitle = "",
  posttitle = "",
  main = NULL,
  mainminmax = !bar,
  mainminmax_minmax = TRUE,
  afterplotfunc = NULL,
  cex.main = par()$cex.main,
  par.list = NULL,
  xaxis = TRUE,
  yaxis = TRUE,
  with_lines = FALSE,
  lines_only = FALSE,
  ...
)

Arguments

x	x values, must form grid with y. If not given, it is assumed to be from 0 to 1.
y	y values, must form grid with x. If not given, it is assumed to be from 0 to 1.
z	z values at grid locations
xlim	x limits for the plot.
ylim	y limits for the plot.
zlim	z limits for the plot.
levels	a set of levels which are used to partition the range of z. Must be strictly increasing (and finite). Areas with z values between consecutive levels are painted with the same color.
nlevels	if levels is not specified, the range of z, values is divided into approximately this many levels.
color.palette	A color palette function to be used to assign colors in the plot. Defaults to cm.colors.strong. Other options include rainbow, heat.colors, terrain.colors, topo.colors, and function(x) {gray((1:x)/x)}.
col	an explicit set of colors to be used in the plot. This argument overrides any palette function specification. There should be one less color than levels
plot.title	statements which add titles to the main plot.
plot.axes	statements which draw axes (and a box) on the main plot. This overrides the default axes.
key.title	statements which add titles for the plot key.
key.axes	statements which draw axes on the plot key. This overrides the default axis.
asp	the y/x aspect ratio, see plot.window.
xaxs	the x axis style. The default is to use internal labeling.
yaxs	the y axis style. The default is to use internal labeling.
las	the style of labeling to be used. The default is to use horizontal labeling.
axes	logical indicating if axes should be drawn, as in plot.default.
frame.plot	logical indicating if a box should be drawn, as in plot.default.
bar	Should a bar showing the output range and colors be shown on the right?
pts	Points to plot on top of contour
reset.par	Should the graphical parameters be reset before exiting? Usually should be unless you need to add something to the plot afterwards and bar is TRUE.
pretitle	Text to be preappended to end of plot title
posttitle	Text to be appended to end of plot title
main	Title for the plot
mainminmax	whether the min and max values should be shown in the title of plot
mainminmax_minmax	Whether [min,max]= should be shown in title or just the numbers
afterplotfunc	Function to call after plotting, such as adding points or lines.
cex.main	The size of the main title. 1.2 is default.
par.list	List of options to pass to par
xaxis	Should x axis be added?
yaxis	Should y axis be added?
with_lines	Should lines be added on top of contour to show contours?
lines_only	Should no fill be used, only contour lines?
...	additional graphical parameters, currently only passed to title().

References

[1] filled.contour R function, copied function but removed part for sidebar

[2] http://stackoverflow.com/questions/16774928/removing-part-of-a-graphic-in-r, answer by P Lapointe

Examples

x <- y <- seq(-4*pi, 4*pi, len = 27)
r <- sqrt(outer(x^2, y^2, "+"))
cf_grid(cos(r^2)*exp(-r/(2*pi)))
cf_grid(r, color.palette=heat.colors, bar=TRUE)
cf_grid(r, color.palette=function(x) {gray((1:x)/x)}, bar=TRUE)

ContourFunctions documentation built on Sept. 11, 2024, 8:47 p.m.