public void print(){
		for(int k=0;k<=cols;k++){
			System.out.print(vnames[k]+"\t");
		}
		System.out.print("\n");
		for(int k=0;k<=cols;k++){
			System.out.print(vunits[k]+"\t");
		}
		System.out.print("\n");
		for(int i=0;i<rows;i++){
			for(int j=0;j<cols;j++){
				System.out.print(vls[i][j]+"\t");
			}
			System.out.print("\n");
		}
	}