Bar Plot ggplot2 Filling bars with cross hatching
Rolf Turner wrote:
On 20/01/2009, at 1:46 PM, Duncan Murdoch wrote:
On 19/01/2009 7:36 PM, stephen sefick wrote:
what is your suggestion for distinguishing between many bars without
color? I have grown up in the time of standarized tests - good or
bad
I never felt nauseous.
Use gray levels or labels. If "many" is bigger than 5, it's not going
to be easy, whatever method you are using.
I disagree. Grey levels suck; labels are a kludge. It is an issue for ``many'' == 2, for which crosshatching works perfectly.
Could you show an example? There are several BW examples in example(barplot), and the gray ones look better on screen than the cross-hatched one. (Not to say it makes a very good choice of cross-hatching, but I suspect the gray examples will look better than any 5 cross-hatch patterns.) I haven't tried printing the examples, so I'm not sure the gray would reproduce well on paper; I wouldn't try to print those 5 gray levels on a typical printer. Duncan Murdoch
cheers, Rolf
Duncan Murdoch
Stephen
On Mon, Jan 19, 2009 at 5:20 PM, Greg Snow <Greg.Snow at imail.org>
wrote:
I think the fact that the grid package does not support cross-
hatching is a feature not a bug (or deficiency), and I hope that
this is not "fixed". Tufte's book (The Visual Display of
Quantitative Information) has a section on why cross-hatching
should be avoided (unless of course your goal is to induce nausea
in the observer rather than convey information).
I would edit Hadley's statement below to say "fortunately there's
no way to do this in ggplot2".
--
Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
greg.snow at imail.org
801.408.8111
-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
project.org] On Behalf Of hadley wickham
Sent: Thursday, January 15, 2009 10:55 AM
To: stephen sefick
Cc: R-help
Subject: Re: [R] Bar Plot ggplot2 Filling bars with cross hatching
Hi Stephen,
#I am putting a test together for an introductory biology class
and I
would like to put different cross hatching inside of each bar
for the
bar plot below
ggplot2 uses the grid package to do all the drawing, and currently grid doesn't support cross-hatching, so unfortunately there's no way to do this in ggplot2. Regards, Hadley -- http://had.co.nz/
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