Generate random presence/absence matrix
Usage
ec_generate_pa(nsit, nspc, probs, ...)
ec_order_pa(x, by = c("both", "site", "species"), decreasing = TRUE)Arguments
- nsit
number of site (determine the number of rows).
- nspc
number of species (determine the number of columns).
- probs
numeric vector of probabilities presence of species. If there are less elements than species, then the vector is recycled and if there are more, the vector is truncated (see
rep_len())- ...
further arguments passed on to
ec_pa().- x
a
paobject or an R object to a coerced to one (seeec_as_pa()).- by
dimension along which the
paobject should be ordered, default is set to "both".- decreasing
Should the sort order be increasing or decreasing? see
order().
Examples
ec_generate_pa(20, 10, .1)
#> ! No presence data for the following species: 1, 3, 5, 8, 10
#> ! Empty site(s): 2, 3, 5, 6, 7, 8, 11, 13, 16, 17, 18, 19, 20
#> ℹ Presence absence matrix: 20 sites, 10 species, 7 occurrences.
#> spc_01 spc_02 spc_03 spc_04 spc_05 spc_06 spc_07 spc_08 spc_09 spc_10
#> sit_01 0 1 0 0 0 0 0 0 0 0
#> sit_02 0 0 0 0 0 0 0 0 0 0
#> sit_03 0 0 0 0 0 0 0 0 0 0
#> sit_04 0 0 0 0 0 1 0 0 0 0
#> sit_05 0 0 0 0 0 0 0 0 0 0
#> sit_06 0 0 0 0 0 0 0 0 0 0
#> sit_07 0 0 0 0 0 0 0 0 0 0
#> sit_08 0 0 0 0 0 0 0 0 0 0
#> sit_09 0 0 0 0 0 0 0 0 1 0
#> sit_10 0 0 0 1 0 0 0 0 0 0
#> ℹ Only the first 10 sites are displayed.
ec_order_pa(ec_generate_pa(20, 10, .1))
#> ! No presence data for the following species: 9, 10
#> ! Empty site(s): 5, 9, 11, 13, 14, 16, 17, 19, 20
#> ! No presence data for the following species: 9, 10
#> ! Empty site(s): 12, 13, 14, 15, 16, 17, 18, 19, 20
#> ℹ Presence absence matrix: 20 sites, 10 species, 15 occurrences.
#> spc_01 spc_02 spc_03 spc_04 spc_05 spc_06 spc_07 spc_08 spc_09 spc_10
#> sit_01 1 0 0 1 0 0 1 0 0 0
#> sit_02 1 1 1 0 0 0 0 0 0 0
#> sit_03 0 0 0 0 0 0 0 1 0 0
#> sit_04 1 0 0 0 0 0 0 0 0 0
#> sit_05 1 0 0 0 0 0 0 0 0 0
#> sit_06 0 0 0 0 1 0 0 0 0 0
#> sit_07 0 0 0 0 0 1 0 0 0 0
#> sit_08 0 0 0 1 0 0 0 0 0 0
#> sit_09 0 0 0 0 1 0 0 0 0 0
#> sit_10 0 0 1 0 0 0 0 0 0 0
#> ℹ Only the first 10 sites are displayed.