[R] Bar Plot ggplot2 Filling bars with cross hatching

[Don McKenzie]

On 19-Jan-09, at 4:59 PM, 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.
>
> 		cheers,
>
> 			Rolf

I believe Tufte had negative things to say about barplots, hatched or  
not.  He said something to the effect
of "Why use a two-dimensional rectangle to represent a one- 
dimensional data point?"

What about a dotplot with a different symbol for each of what would  
have been hatched rectangles?
That reduces the ink/information ratio (which I believe was also a  
concern of Tufte's).

Don

>
>> 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/
>>>>>
>>>>> ______________________________________________
>>>>> R-help at 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.
>>>
>>>
>>>
>>
>> ______________________________________________
>> R-help at 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.
>
>
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Don McKenzie, Research Ecologist
Pacific WIldland Fire Sciences Lab
US Forest Service

Affiliate Professor
College of Forest Resources
CSES Climate Impacts Group
University of Washington

desk: 206-732-7824
cell: 206-321-5966
dmck at u.washington.edu
donaldmckenzie at fs.fed.us