[R] Indexing Elements of a Dataframe
Wolfgang Viechtbauer
wviechtb at s.psych.uiuc.edu
Tue May 28 20:40:13 CEST 2002
Hello List-Members,
Let's say that I have the following code:
for (i in c(10, 20, 30)) {
for (j in c(200, 400, 600)) {
...
...
x <- "something"
* (code here)
}
}
* Now, x is some result that I want to put into a results "matrix" that
looks like this:
200 400 600
10
20
30
I came up with an ad-hoc solution adding some counters (called "ro" and
"co") and using a matrix for the results, which I could index with those
counters (results[ro,co] <- x) and then converting that matrix into a
dataframe and changing the row and column names. That seems a little too
convoluted.
I tried to come up with a "neater" solution, trying to create a
dataframe that looks like the one above and then indexing the fields in
the dataframe by results$i[j] but I couldn't get it to work. Is there a
way of doing this or maybe a better solution?
Thanks in advance!
Wolfgang
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