[R] drawing dot plots with size, shape affecting dot characteristics

2010-08-12 Thread Brian Tsai 
Hi all,

I'm interested in doing a dot plot where *both* the size and color (more
specifically, shade of grey) change with the associated value.

I've found examples online for ggplot2 where you can scale the size of the
dot with a value:

http://had.co.nz/ggplot2/graphics/6a053f23cf5bdfe5155ab53d345a5e0b.png

Or scale the color with the value:

http://had.co.nz/ggplot2/graphics/b17bf93530ff6695afb366e65677c17f.png

both of which are from here:
http://had.co.nz/ggplot2/geom_point.html

but I've been playing around with ggplot2 and couldn't figure out how to do
both at the same time - ideally i want size to increase with a value, and
the shade of grey to get lighter with increasing value.


Any help's appreciated, thanks!

Brian

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Re: [R] drawing dot plots with size, shape affecting dot characteristics

2010-08-12 Thread Michael Bedward 
Try running this and see if it does what you want. It just uses plain
old plot with the cex arg for size and the col arg for colour...

greyDots - function() {
  # make up some data
  x - runif(50, 0, 10)
  y - runif(50, 0, 10)
  valueMax - 100
  value - sample(valueMax, 50)

  # edit these to taste
  maxDotSize - 5
  maxGreyLevel - 0.8

  plot(x, y, pch=16, xlim=c(0,10), ylim=c(0,10),
   cex=maxDotSize * value / valueMax,
   col=grey(maxGreyLevel * value / valueMax))
}


On 12 August 2010 13:14, Brian Tsai btsa...@gmail.com wrote:
 Hi all,

 I'm interested in doing a dot plot where *both* the size and color (more
 specifically, shade of grey) change with the associated value.

__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

Re: [R] drawing dot plots with size, shape affecting dot characteristics

2010-08-12 Thread Hadley Wickham 
On Wed, Aug 11, 2010 at 10:14 PM, Brian Tsai btsa...@gmail.com wrote:
 Hi all,

 I'm interested in doing a dot plot where *both* the size and color (more
 specifically, shade of grey) change with the associated value.

 I've found examples online for ggplot2 where you can scale the size of the
 dot with a value:

 http://had.co.nz/ggplot2/graphics/6a053f23cf5bdfe5155ab53d345a5e0b.png

 Or scale the color with the value:

 http://had.co.nz/ggplot2/graphics/b17bf93530ff6695afb366e65677c17f.png

 both of which are from here:
 http://had.co.nz/ggplot2/geom_point.html

 but I've been playing around with ggplot2 and couldn't figure out how to do
 both at the same time - ideally i want size to increase with a value, and
 the shade of grey to get lighter with increasing value.

qplot(mpg, wt, data = mtcars, colour = qsec, size = qsec) + scale_colour_grey()

Hadley

-- 
Assistant Professor / Dobelman Family Junior Chair
Department of Statistics / Rice University
http://had.co.nz/

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