Remko,
Thank you for your reply. When I try your code, I'm getting the following
error:
acts10 <-read.table('RailAccident10.txt',sep=',',header=T)
> acts11 <- acts10[acts10$ACCDMG > 10^5,]
> h.test <- substr(acts11$CAUSE,1,1)
> h.data <- acts11[h.test == 'H']
Error in `[.data.frame`(acts11, h.test == "H") :
undefined columns selected
To confirm that acts11$CAUSE is there, I did this:
summary(substr(acts11$CAUSE,1,1)=='H')
And got this:
Mode FALSE TRUE NA's
logical 393 156 0
Any idea what I'm doing wrong?
Thanks again, I really appreciate your help.
On Sun, Nov 20, 2011 at 7:13 PM, Remko Duursma [via R] <
ml-node+s789695n4090042...@n4.nabble.com> wrote:
>
> dfr <- data.frame(txt= c("abab","ghghg","ththt","dfdfdf"), yvar=1:4)
>
> ind <- substr(dfr$txt,1,2)
>
> dfr[ind == "ab",]
>
>
>
> greetings,
> Remko
>
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