Hello- I have some code that looks like this:
with(mydatalocal, sum(table(Service[Time==5:8]))) This is designed to add up the numbers of responses between the Time codes 5 to 8 (which are integers and refer to quarters). Service is just one of the variables, I'm just trying to count the number of responses so I picked any of the variables. However, there is something wrong, it returns far too low a number for the number of responses. Indeed, if I run this: with(mydatalocal, sum(table(Service[Time==5|Time==6|Time==7|Time==8]))) I get 4 times as many responses. I've tried to recreate the problem with the following code: mydata=data.frame(matrix(c(rep(1, 10), rep(2, 10), rep(3, 10), seq(1, 10, 1), seq(11, 20, 1), seq(21, 30, 1)), ncol=2)) with(mydata, sum(table(X1[X2==9:12]))) with(mydata, sum(table(X1[X2==9|X2==10|X2==11|X2==12]))) but to my immense frustration it actually seems to work fine there, the same number, 4, both times. However, it does generate the following error message: In X2 == 9:12 : longer object length is not a multiple of shorter object length I know I can use X1[ Time < 9 & Time > 3] but I would like to know what is wrong with the 5:8 usage in case I put it somewhere else and don't notice the problem. Many thanks! Chris Beeley Institute of Mental Health ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.