public void exporte(File f) throws IOException{
		OutputStreamWriter destinationFile = new OutputStreamWriter(new FileOutputStream(f));

		for (int i=0;i<M[0].length;i++){
			destinationFile.write(Integer.toString(i));
			if(i != M[0].length -1) destinationFile.write(';');
		}
		destinationFile.write('\n');
		for (int j=0;j<M.length;j++){
			for (int i=0;i<M[0].length;i++){
				destinationFile.write(Double.toString(M[j][i]));
				if(i != M[0].length -1) destinationFile.write(';');
			}
			destinationFile.write('\n');
		}
		destinationFile.close();
	}