can't find the error in if function... maybe i'm blind?
Le samedi 20 octobre 2012 ? 03:27 -0700, Janosch a ?crit :
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!
You could have told us what this error means in English, but my guess is that File$X.Frame.Number[a] or File$X.Frame.Number[a + 1] is NA, which means that the whole expression evaluates to NA, which is not corrrect for if(). If you want NAs to be considered as FALSE, than put the expression inside a isTRUE() call. If NAs are not expected there in your code, there's a problem elsewhere. Since the loop stops when the error is raised, "a" still contains the value that produced it and you can easily check where the problem comes from that way. My two cents
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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