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### wideByFactor.R
###------------------------------------------------------------------------
### What: Reshape by factor levels - code
### $Id$
### Time-stamp: <2008-12-30 22:17:32 ggorjan>
###------------------------------------------------------------------------
wideByFactor <- function(x, factor, common, sort=TRUE, keepFactor=TRUE)
{
## --- Setup ---
if(!is.data.frame(x)) stop("'x' must be a data frame")
if(length(factor) != 1) stop("'factor' can be only of length one")
if(!is.factor(x[[factor]])) stop("column defined in 'factor' must be a factor")
if(sort) x <- x[order(x[[factor]]), ]
## --- Extend by factors levels ---
y <- x[common]
if(keepFactor) y[factor] <- x[factor]
levs <- levels(x[[factor]])
## Remove common and factor from the list of column names
other <- names(x)
other <- other[!(other %in% common) & !(other %in% factor)]
## Add all other columns but as a set for each level of a factor
for(level in levs) {
for(col in other) {
## add a column col
y[paste(col, level, sep=".")] <- x[col]
## fill with NA for other levels than level
y[x[factor] != level, paste(col, level, sep=".")] <- NA
## This filling migth be inefficient if there is large number
## of levels, since there will be quite a lot of filling.
}
}
y
}
###------------------------------------------------------------------------
### wideByFactor.R ends here
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