can't find the error in if function... maybe i'm blind?
Learn how to debug your programs. Start with options(error = recover) this will give you control at the point of the error so you can examine values. Most likely one of the variables in the 'if' expression is an NA. Sent from my iPad
On Oct 20, 2012, at 6:27, Janosch <Janosch1985 at web.de> wrote:
Hi everybody,
the following alway gives me the error
"Fehler in if (File$X.Frame.Number[a] + 1 == File$X.Frame.Number[a + 1])
(File$FishNr[a] <- File$FishNr[a - : Fehlender Wert, wo TRUE/FALSE n?tig
ist". Maybe its stupid, but i'm not getting why... Maybe someone can help
me. Thanks a lot!
for (i in unique(BigFile$TrackAll))
{ File <- subset(BigFile,BigFile$TrackAll == i)
File$FishNr [1] <- 1
for ( a in File$X.Frame.Number)
{if(File$X.Frame.Number[a]+1== File$X.Frame.Number[a+1])
(File$FishNr [a] <- File$FishNr[a-1])
else(if (File$X.Frame.Number[a]+1 !=
File$X.Frame.Number[a+1])
(File$FishNr [a] <- File$FishNr[a-1]+1 ))
}
}
--
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