If two samples share no loci typed in common, they are incomparable and will produce missing data in a distance matrix, which could lead to problems with further analyses. This function finds these samples and returns a matrix of how many other samples these are incomparable with.
Examples
data(nancycats)
# These two populations have no samples that are incomparable
incomp(nancycats[pop = c(1, 17)])
#> <0 x 0 matrix>
# If you reduce the number of loci, we find that there are
# incomparable samples.
incomp(nancycats[pop = c(1, 17), loc = c(1, 4)])
#> N215 N216 N282 N283 N288 N291 N292 N293 N294 N295 N296 N297 N281 N289 N290
#> N215 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0
#> N216 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0
#> N282 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1
#> N283 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1
#> N288 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1
#> N291 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1
#> N292 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1
#> N293 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1
#> N294 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1
#> N295 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1
#> N296 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1
#> N297 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1
#> N281 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1
#> N289 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1
#> N290 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1