l_which | R Documentation |
Inverse of which. Converts an array of numeric or character indices to a logical index array. This function is useful if you need to perform logical operation on an index array but are only given numeric indices.
l_which(idx, nms = seq_len(len), len = length(nms), useNames = TRUE)
idx |
Numeric or character indices. |
nms |
Array of names or a sequence. Required if |
len |
Length of output array. Alternative to |
useNames |
Use the names of nms or idx |
Either nms
or len
has to be specified.
Logical vector of length len
or the same length as nms
all(l_which(2, len = 3L) == c(FALSE, TRUE, FALSE))
all(l_which(c('a', 'c'), letters[1:3]) == c(TRUE, FALSE, TRUE))
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