qdraw {io}

Draw plot

Description

This funtion draws a plot to screen, a file, or both.

Usage

qdraw(
  expr,
  file = NULL,
  device = getOption("plot.device"),
  width = NULL,
  height = NULL,
  aspect.ratio = NULL,
  units = NULL,
  res = NULL,
  mkpath = TRUE,
  symlink = TRUE,
  ...
)

Arguments

expr

expression for plotting

file

filename

device

plot device

width

plot width [default: 5]

height

plot height [default: 5]

aspect.ratio

ratio of width to height

units

unit of plot dimension [default: "in"]

res

bitmap resolution, used only by bitmap formats [default: 300]

mkpath

whether to create parent directories (if they do not already exists)

symlink

whether to create a symlink to file with a simplified filename (ignored if file is not a filename object); an existing file will not be overwritten but an existing symlink will be

...

other arguments passed to the plot device function

Details

To send the plot to screen, set device to NA (default). Optionally, to print the plot on screen to a file, specify file.

If device is NULL, the plot will be sent directly to the the specified file using a printing device inferred from the file extension (no graphical window will open).

Set the global option plot.device to affect multiple plots. Graphical parameters including width, height, res, units are obtained from the global option getOption("plot").

Examples

## Not run: 
# Set device to jpeg (remember to update file extensions for printed plots)
options(plot.device=jpeg)
qdraw(plot(1:10), "plot.jpeg")

# Enable automatic plot format inference
options(plot.device=NULL)

# Plot directly to file (format is inferred from filename extension)
qdraw(plot(1:10), "plot.pdf")

# Plot to screen, then print to file (display will not be closed)
qdraw(plot(1:10), "plot.png", device=NA)

# If an error occurs, be sure to clear the current plot
dev.off()
# or clear all plots
graphics.off()

## End(Not run)