Hello,
It's bad to use the subset operator '$' because you don't have a column
named 'j'. Use data[[j]]
Hope this helps,
Rui Barradas
Em 27-11-2012 21:22, Allan Schwade escreveu:
Hi all,
First time poster, so sorry if I commit some breech of posting etiquette.
My problem is as follows. I have a data frame where each column represents
a category and the individual data points in each category are binary
responses (in this case they are actually 1's and 0's). What I want to
extract are the counts for each category and put them in a vector. To do
that I used the following:
cats<-c("cat1","cat2", "cat3", ...)
c()->counts
for(j in cats){
append(counts, sum(data$j)) -> counts
}
However, the 'counts' object only contains 0's after the script runs:
counts
[1] 0, 0, 0, ....
After replacing various elements in the script to isolate what the issue
is, I've discovered the problem stems from "data$j". Is there a reason
using a variable with the subset operator is bad?
Thanks,
Allan
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