Eliminate duplicate instances of profile IDs in a list of SoilProfileCollections

@description Experimental function to "clean" list input where duplicates exist (that would otherwise prevent pbindlist). Useful for queries that may have overlapping instances of the same data, for instance a list of SoilProfileCollections where each list element contains profiles gathered from a set of (potentially overlapping) extents.

lunique(l)

Arguments

l

A list of SoilProfileCollections.

Value

A list of SoilProfileCollections, with duplicate profile IDs removed.

Author

Andrew G. Brown

Examples

data(sp5)

# EXAMPLE #1 -- resolving overlap

# 6 profiles in four sets, and 5,6,7 are missing
input <- lapply(list(c(1,3,4), c(2,2,3), NA, c(8,9,1)), function(idx) {
      if(!all(is.na(idx)))
       sp5[idx,]
})

output <- lunique(input)

# 6 profiles are in final SPC; 5,6,7 are missing
match(profile_id(pbindlist(output)), profile_id(sp5))
#> pbindlist: one or more input list elements is NA
#> [1] 1 2 3 4 8 9

# EXAMPLE #2 -- exact duplicates

# deliberately duplicate an SPC
sp5_2 <- sp5
res <- lunique(list(sp5, sp5_2))

# the number of profiles in first element is equal to number in sp5
length(res[[1]]) == length(sp5)
#> [1] TRUE

# second list element contains NA b/c all uniques are in #1
res[[2]]
#> [1] NA