function(arrays) {
		var hashes = [];
		for (var i=0; i<arrays.length; ++i)
			hashes[i] = this.arrayToHash(arrays[i]);
		return hashes;
	}
function(arrays) {
		var hashes = [];
		for (var i=0; i<arrays.length; ++i)
			hashes[i] = this.arrayToHash(arrays[i]);
		return hashes;
	}
function ( arrays ) { var hashes = [ ] ; for ( var i = 0 ; i < arrays . length ; ++ i ) hashes [ i ] = this . arrayToHash ( arrays [ i ] ) ; return hashes ; }
Convert the given numeric arrays to array of hashes of features, ignoring zero values.
Convert the given numeric arrays to array of hashes of features ignoring zero values .