On Nov 21, 2011, at 10:00 AM, aclinard wrote:
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']
MIssing comma about here ........^
Error in `[.data.frame`(acts11, h.test == "H") :
undefined columns selected
The error message is telling you that you tried to select a colum nad
you should have thought to yourself:
" a "column"?
I wanted a row.
So what have I done that made the "[" function "think" I wanted a
column?
(Yes, I know that computers can't think. But they can report what they
were attempting to do when they "gave up" in desperation about being
told to do impossible things by their owners. )
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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