要获取从第二行开始的数据:按列分别存入double型数组x[]和y[]
103   ss     nava
1.00000000 0.00000000
0.99000000 0.00249000
0.98000000 0.00457800
0.97000000 0.00664700
0.96000000 0.00871400
0.95000000 0.01080100
0.94000000 0.01291600
0.93000000 0.01505900
0.92000000 0.01723000
0.91000000 0.01942800
0.90000000 0.02164900
0.87500000 0.02729000
0.85000000 0.03302200
0.82500000 0.03880500