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df_df
2013 Mar 06
1
red SNA
...group = c('a','b','c','a','b','c','d','b','d'),
stringsAsFactors = F)
df
m = table( df )
M = as.matrix( m )
# o M = as.matrix( table(df) )
Mrow = M %*% t(M)
Mrow
Mcol = t(M) %*% M
Mcol
df_yo <- data.frame( person =
c('Sam','Sam','Sam','Greg','Tom','Tom','Tom','Mary','Mary'),
group = c('a','b','c','a','b','c','d','b','d'),...