B.6 Examples of PERL and R Program Code
B.6.2 R-function f.gupta.R
# Function which builds a distance matrix from mined
# frequent itemsets according to Gupta/Strehl/Gosh (1999) f.gupta <- function(rulz, trans){
z <- dim(trans)[1]
S <- quality(rulz)[,1]*z
# Transformation of the rules into a matrix (rule matrix) rmx <- as(items(rulz), "matrix")
# The following function adds the j-row to all rows of the rule matrix f.sum <- function(x, j){ x + rmx[j, ] }
for(k in 1:j) {
# Prints the number of each rule for which the function
# is calculating the distance measure print(k)
# Combined item matrix of two rules: for every row of rmx the
# following expression adds with f.sum each j-rule to each
# j-rule of the rule matrix. Since the rows of the resulting
# matrix represent the items, "t()" transposes it and "as()"
# transforms it into an item matrix.
rmxar <- as(t(apply(rmx, 1, f.sum, k)), "itemMatrix")
# Calculating the distance measure between every rule (rows of rmx):
# Due to the presence of item matrix (rmxar), the support of every
# combined rule (scr) can be calculated within the transactions.
for(m in k:i) {
scr <- support(rmxar[m], trans, "absolute")
distm.t[m, k] <- (1 - ( scr / (S[k] + S[m] - scr))) }
}
distm.t <- as.dist(distm.t) return(distm.t)
}
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