R - how many pairwise combinations

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how many pairwise combinations

# Given "LIST" a list of N elements, the number of unique pairwise comparisons 
# among them is given by the formula:
ncomp = N(N-1)/2

# In order to operate all the pairwise comparison in R
library(RcppAlgos)

comboGeneral( LIST , m=2 ). #m = 2 mean PAIRWISE comparison

#To operate multiple comparisons (among 3 or mode elements) just increase m

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how many pairwise combinations

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