I have this data
我有这个数据
date signal
1 2009-01-13 09:55:00 4645.00 4838.931 5358.883 Buy2
2 2009-01-14 09:55:00 4767.50 4718.254 5336.703 Buy1
3 2009-01-15 09:55:00 4485.00 4653.316 5274.384 Buy2
4 2009-01-16 09:55:00 4580.00 4537.693 5141.435 Buy1
5 2009-01-19 09:55:00 4532.00 4548.088 4891.041 Buy2
6 2009-01-27 09:55:00 4190.00 4183.503 4548.497 Buy1
7 2009-01-30 09:55:00 4436.00 4155.236 4377.907 Sell1
8 2009-02-02 09:55:00 4217.00 4152.626 4390.802 Sell2
9 2009-02-09 09:55:00 4469.00 4203.437 4376.277 Sell1
10 2009-02-12 09:55:00 4469.90 4220.845 4503.798 Sell2
11 2009-02-13 09:55:00 4553.00 4261.980 4529.777 Sell1
12 2009-02-16 09:55:00 4347.20 4319.656 4564.387 Sell2
13 2009-02-17 09:55:00 4161.05 4371.474 4548.912 Buy2
14 2009-02-27 09:55:00 3875.55 3862.085 4101.929 Buy1
15 2009-03-02 09:55:00 3636.00 3846.423 4036.020 Buy2
16 2009-03-12 09:55:00 3420.00 3372.665 3734.949 Buy1
17 2009-03-13 09:55:00 3656.00 3372.100 3605.357 Sell1
18 2009-03-17 09:55:00 3650.00 3360.421 3663.322 Sell2
19 2009-03-18 09:55:00 3721.00 3363.735 3682.293 Sell1
20 2009-03-20 09:55:00 3687.00 3440.651 3784.778 Sell2
date 
