[R] Add group name in barchart

[Michael Dewey]

Comments in line

On 02/12/2014 23:27, Silong Liao wrote:
> Dear ALL,
>
> I have a dataset contains 2 variables: mate (mating groups) and ratio (ratio of number of mothers and fathers). And mate is an identifer which consists three components: year, flock (flk), and tag.
>
> I am using command "barchart" under package "lattice" to generate plots of ratio against mate divided by each flock (See attachment). I want to put flock names onto the corresponding plots, but don't know how.
>
> Cheers, Sid
>
> load("ratiodata.Rdata")
> attach(ratiodata)

in general it is a bad idea to use attach, use the data= parameter if 
available.

> head(ratiodata)
>
>          mate    ratio1 2007.102.A 21.285712 2007.102.B 68.200003 2007.102.C 59.500004 2007.102.D 19.333335 2007.102.E 72.333336 2007.102.F 35.50000
> str(ratiodata$mate) #factor
> str(ratiodata$ratio) #num
> unique(ratiodata$flk)
>
> [1]  102    2 2744 2747 2749  391 4357 4880 3001 3003 3004 3855 3658 4588 4591 4631
> library("lattice")
> ratiodata$flk=read.table(text=as.character(ratiodata$mate),sep=".")[,2]

So what did this give you for flk?

> barchart(ratiodata$ratio~ratiodata$mate|ratiodata$flk)

This could be

barchart(ratio ~ mate | flk, data = ratiodata)

which is much easier to read.
So what did it label the panels with?

>
>
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-- 
Michael
http://www.dewey.myzen.co.uk