public void writeAll() throws FileNotFoundException, IOException{
WritableWorkbook workbook = Workbook.createWorkbook(outputFile);
WritableSheet sheet = workbook.createSheet("results", 0);
try {
sheet.addCell(new Label(0, 0, "NUMBER OF PILE ELEMENTS"));
sheet.addCell(new Label(0, 1, "PILE LENGTH (m)"));
sheet.addCell(new Label(0, 2, "PILE EI (KN M²)"));
sheet.addCell(new Label(0, 3, "DIAMETER OF PILE (m)"));
sheet.addCell(new Label(0, 4, "NUMBER OF INCREMENTAL SOIL DISPLACEMENTS"));