I'm learning how to use tapply.
Now I'm having a go at the following code in which dati contains almost 600
lines, Pot - numeric - are the capacities of power plants and SGruppo - text
- the corresponding six technologies ("CCC", "CIC","TGC", "CSC","CPC", "TE").
.....................................................
dati=sqlQuery(canale,"select Id,SGruppo,Classe, NGruppo,ProdNetta,Pot from
SintesiQuery")
attach(dati)
# Grouping by technology
tapply(Pot,SGruppo,sum)
...................................
# Histograms by technology
par(mfrow=c(2,3))
tapply(Pot,SGruppo,hist)
detach(dati)
It all works great but tapply(Pot,SGruppo,hist) produces 6 histograms with
the titles and the xlab labels in a generic form, something like integer[1],
integer[2], ....... while I'd like to have each graph indicating the
mentioned technologies.
I've been trying issuing
tech=c("CCC", "CIC","TGC", "CSC","CPC", "TE")
tapply(Pot,SGruppo,hist, main=tech)
but R prints in each histogram the six values in the title without cycling
among them.
How can I obtain what I want?
Ciao
Vittorio
to no avail
______________________________________________
[EMAIL PROTECTED] mailing list
https://www.stat.math.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
