TeachingDemos (version 2.13)

zoomplot: Zoom or unzoom an existing plot in the plot window

Description

This function allows you to change the x and y ranges of the plot that is currently in the plot window. This has the effect of zooming into a section of the plot, or zooming out (unzooming) to show a larger region than is currently shown.

Usage

zoomplot(xlim, ylim=NULL )
oldzoomplot(xlim, ylim=NULL )

Value

This function is run for its side effects and does not return anything meaningful.

Arguments

xlim, ylim

The new x and y limits of the plot. These can be passed in in any form understood by xy.coords. The range of xlim and ylim are actually used so you can pass in more than 2 points.

Author

Greg Snow

Details

This function recreates the current plot in the graphics window but with different xlim, ylim arguments. This gives the effect of zooming or unzooming the plot.

This only works with traditional graphics (not lattice/trellis).

This function is a quick hack that should only be used for quick exploring of data. For any serious work you should create a script with the plotting commands and adjust the xlim and ylim parameters to give the plot that you want.

Only the x and y ranges are changed, the size of the plotting characters and text will stay the same.

The oldzoomplot function is the version that worked for 2.15 and earlier, zoomplot should be used for R 3.0.

See Also

plot.default, par, matplot, plot2script, source

Examples

if(interactive()){

with(iris, plot(Sepal.Length, Petal.Width,
    col=c('red','green','blue')[Species]))
text( 6.5, 1.5, 'test' )
zoomplot( locator(2) ) # now click on 2 points in the plot to zoom in

plot( 1:10, rnorm(10) )
tmp <- rnorm(10,1,3)
lines( (1:10) + 0.5, tmp, col='red' )
zoomplot( c(0,11), range(tmp) )
}