Function to create spp x spp matrix of potential co-occurring sites (N) from a potential spp x site matrix.
Returns a spp x spp matrix of potential co-occurring sites from spp x site matrix of possible species occupancy.
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
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#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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