public static void matrixUnitChange(){
		double[][] rtt = readMatrixDouble("dataset1//rtMatrix", 150, 100);
		String result = "";
		for (int i = 0; i < rtt.length; i++) {
			for (int j = 0; j < rtt[0].length; j++) {
				result += rtt[i][j]/1000;
				if(j == rtt[0].length - 1) result += "\r\n"; 
				else result += "\t"; 
			}
		}
		
		String path = "dataset1//rtMatrixSecond";
		File f = new File(path);
		if(f.exists()) f.delete();
		writeFile(path, result);
	}