Find first of repeated elements
This function works similar to unique, but provides additional information about which elements of original input 'x' are repeatd by providing indexes realtoe to the input.
firstOfRepeated makes list with 3 elements : $indRepeated.. index for first of repeated 'x', $indUniq.. index of all unique + first of repeated, $indRedund.. index of all redundant entries, ie non-unique (wo 1st).
Used for reducing data to non-redundant status, however, for large numeric input the function nonAmbiguousNum() may perform better/faster.
NAs won't be considered (NAs do not appear in reported index of results), see also firstOfRepLines() .
firstOfRepeated(x, callFrom = NULL)
x |
(charcter or numeric) main input |
callFrom |
(character) allow easier tracking of message(s) produced |
list with indices: $indRepeated, $indUniq, $indRedund
duplicated, nonAmbiguousNum, firstOfRepLines gives less detail in output (lines/elements/indexes of omitted not directly accessible) and works fsster
x <- c(letters[c(3,2:4,8,NA,3:1,NA,5:4)]); names(x) <- 100+(1:length(x)) firstOfRepeated(x) x[firstOfRepeated(x)$indUniq] # only unique with names
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