Hi all, I'm working with GPS dataset from seabirds that include more than one trip for each burst, and currently I'm trying to split then automatically in sub-burst based on a criterion.
To do that I'm trying to use the function cutltraj from AdehabitatLT R package. Previously I removed all positions matching an specific condition, so now, after applying the as.ltraj function, my dataframe has ltraj class and I can use the dt field values as criterion to make the split. This criterion is so simple: time between two position > 3600 (units in seconds). This time is enough to determine when the burst need to be splited. I applied it: df <- cutltraj (depurelt, dt>3600, nextr = TRUE) According to this, a logical vector (with TRUE when criterion does match) should work for splitting. If I check with the common datframe class, dt field exists and it's correct, and the logical function dt>3600 run correctly and I get a TRUE-FALSE vector. However, when I run the function I got this error message: Error in dt > 3600 : comparison (6) is possible only for atomic and list types Since ltraj class is in fact a list object, I don't understand why I get this error. If someone have any idea why is this happening, please let me know. Thank you in advance. jose
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