On 08/29/2012 01:05 AM, Geophagus wrote:
Hi @ all,
I have a problem concerning the barplot (barchart lattice) of a dataframe. I
work with the attached dataframe.
When I try to plot this dataframe I only get two rows plottet. When I try
to plot the whole dataframe, there is message, that it is 'height' must be a
vector or a matrix.
On the y-axis, the "amount_cattle" should be displayed and on the x-axis the
"year" and the "country" so that I can compare the amount over the years in
each country. Each country on the x-axis needs 4 bars (2000-2003).
I hope you can help me.
Thanks a lot
geophagus
Hi geophagus,
You seem to want to plot the amount_cattle values for years within
countries. You can do this with the "barplot" function:
amount_cattle<-matrix(sample(10:50,16),nrow=4)
colnames(amount_cattle)<-
c("Muckravia","Blotinsk","Overthar","Fumingo")
rownames(amount_cattle)<-2000:2003
barpos<-barplot(amount_cattle,beside=TRUE)
legend(4,45,2000:2003,fill=gray(c(0.2,0.4,0.6,0.8)))
You can also nest the values by year within the average values for
countries by reshaping the amount_cattle matrix to this form:
newcattle
ncattle country year
1 21 Muckravia 2000
2 19 Blotinsk 2000
3 40 Overthar 2000
4 27 Fumingo 2000
5 46 Muckravia 2001
6 38 Blotinsk 2001
7 39 Overthar 2001
8 48 Fumingo 2001
9 33 Muckravia 2002
10 34 Blotinsk 2002
11 35 Overthar 2002
12 23 Fumingo 2002
13 16 Muckravia 2003
14 30 Blotinsk 2003
15 14 Overthar 2003
16 32 Fumingo 2003
library(plotrix)
barNest(ncattle~country+year,newcattle,FUN="mean",
col=list("lightgray",rainbow(4),
c("wheat","lightgreen","yellow","thistle")))
Jim
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