Returns a spp x spp matrix of potential co-occurring sites from spp x site matrix of possible species occupancy.

1 | ```
create.N.matrix(mat)
``` |

`mat` |
spp x site matrix where 1 = potential occupancy and 0 = species does not occur. |

Returns a spp x spp matrix where the upper triangle contains N for each species pair.

Daniel M Griffith

`pair`

, `pair.attributes`

1 2 3 4 5 6 | ```
#data(finches)
#N_matrix <- matrix(data = rbinom(n = nrow(finches)*ncol(finches),1,prob = 0.75),
# nrow = nrow(finches),
# ncol = ncol(finches)
# ,byrow = T)
#create.N.matrix(N_matrix)
``` |

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