R/strsplit2matrix.R

In bedr: Genomic Region Processing using Tools Such as 'BEDTools', 'BEDOPS' and 'Tabix'

# The bedr package is copyright (c) 2014 Ontario Institute for Cancer Research (OICR)
# This package and its accompanying libraries is free software; you can redistribute it and/or modify it under the terms of the GPL
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strsplit2matrix <- function(x, split, fixed = FALSE, perl = FALSE) {

	# convert factors to character
	if(is.factor(x)) {x <- as.character(labels(x))}
	if(is.list(x)) {x <- x[[1]]}

	x <- strsplit(x, split = split, fixed = fixed, perl = perl);

	n.splits <- sapply(x, length);

	if (length(unique(n.splits)) != 1) {
		max.length <- max(n.splits);
		min.length <- min(n.splits);
		x <- lapply(x, function(x, n) {c(x, rep(NA, n - length(x)))}, max.length)
		}

	x <- as.data.frame(do.call("rbind", x), stringsAsFactors=FALSE);
	return(x);
	}