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### nPairs.R
###------------------------------------------------------------------------
### What: Number of variable pairs - code
### $Id$
### Time-stamp: <2008-12-30 18:29:58 ggorjan>
###------------------------------------------------------------------------
nPairs <- function(x, margin=FALSE, names=TRUE, abbrev=TRUE, ...)
{
## --- Setup ---
if(!is.data.frame(x) & !is.matrix(x)) stop("'x' must be a data.frame or a matrix")
k <- ncol(x)
if(!margin) {
ret <- matrix(nrow=k, ncol=k)
} else {
ret <- matrix(nrow=k, ncol=k + 1)
}
## --- Count ---
diag(ret)[1:k] <- apply(X=x, MARGIN=2, FUN=function(x) sum(!is.na(x)))
for(i in 1:k) {
for(j in i:k) {
ret[i, j] <- ret[j, i] <- sum(!is.na(x[, i]) & !is.na(x[, j]))
if(margin) {
if(i == 1) {
ret[i, (k + 1)] <- ret[1, 1]
} else {
ret[i, (k + 1)] <- sum(rowSums(!is.na(x[, c(1:i)])) == i)
}
}
}
}
## --- Names ---
if(names) {
tmp <- colnames(x)
if(abbrev) tmp <- as.character(abbreviate(tmp, ...))
rownames(ret) <- tmp
if(margin) {
colnames(ret) <- c(tmp, "all")
} else {
colnames(ret) <- tmp
}
}
class(ret) <- c("nPairs", class(ret))
ret
}
summary.nPairs <- function(object, ...)
{
n <- nrow(object)
ret <- matrix(data=0, nrow=n, ncol=n)
for(i in 1:n) {
tmp <- 1:n
tmp <- tmp[!(tmp == i)]
ret[i, tmp] <- object[i, i] - object[i, tmp]
}
dimnames(ret) <- dimnames(object)
ret
}
###------------------------------------------------------------------------
### nPairs.R ends here
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