On 18 Jun 2008, at 10:36, Sybille Wendel wrote:
I need a command.
I have a lot of data in different dataframes(auto.0a, auto.0b, auto.
0c, auto.5Na,...), that has similar names.
I could print the names all at once wih a loop with the command
paste(), see below:
plot<-
c("0a","0b","0c","5Na","5Nb","5Nc","PKa","PKb","PKc","5NPKa","5NPKb",
"5NPKc","10NPKa","10NPKb","10NPKc","20NPKa","20NPKb","20NPKc")
for (x in 1:length(plot))
{
name<-paste("auto.",plot[x],sep="")
print(name)
}
First of all, maybe it is better to avoid to name a variable 'plot'.
It works, but it could be a bit confusing.
You can do this easier (paste can handle vectors etc.):
name<-paste("auto.", plot, sep="")
I want to do very similar things with all the dataframes and their
structure is also the same.
Is there a way to write a loop? (so that I don't have to write the
same 18 times)
I tried things like that:
for (x in 1:length(plot))
{
plot(paste("auto.",plot[x],sep="")[,1],paste("auto.",plot[x],sep="")
[,2],col=...)
}
paste("auto.",plot[x],sep="")[,1] => doesn't work.
Assuming that 'auto.0a' is a data.frame you should use
get(paste("auto",".0a",sep=''))[,1]
instead to get the first column of the data.frame 'auto.0a'
Maybe try:
plot(get(paste("auto.",plot[x],sep=""))[,1],
get(paste("auto.",plot[x],sep=""))[,2], col=...)
--Hans
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