求教，关于编写的公式运行频率。

livelyimp

我用了两品种，然后把时间，和价差等什么都输出，为什么，有的秒有好多数据，有的有没有？

数据格式：时间，毫秒，品种1价格，品种2价格，价差，。。。
09:43:58,500,2479,1037,-629.160139,0.785313,-627.590519,-630.728926
09:43:58,500,2479,1037,-629.160139,0.785313,-627.590519,-630.728926
09:43:59,0,2479,1037,-629.160556,0.786024,-627.589513,-630.730765
09:43:59,0,2479,1037,-629.160556,0.786024,-627.589513,-630.730765
09:43:59,500,2479,1037,-629.160972,0.786733,-627.588508,-630.732603
09:43:59,500,2479,1037,-629.160972,0.786733,-627.588508,-630.732603
09:44:00,0,2478,1037,-629.161389,0.787442,-627.587506,-630.734439
09:44:00,0,2478,1037,-629.161389,0.787442,-627.587506,-630.734439
09:44:00,500,2478,1037,-629.161944,0.788738,-627.586505,-630.736273
09:44:00,500,2478,1037,-629.161944,0.788738,-627.586505,-630.736273
09:44:01,0,2479,1037,-629.1625,0.790031,-627.584469,-630.73942
09:44:01,0,2479,1037,-629.1625,0.790031,-627.584469,-630.73942
09:44:01,500,2479,1037,-629.162917,0.790736,-627.582438,-630.742562
09:44:01,500,2479,1037,-629.162917,0.790736,-627.582438,-630.742562
09:44:03,500,2479,1037,-629.163333,0.79144,-627.581444,-630.744389
09:44:03,500,2479,1037,-629.163333,0.79144,-627.581444,-630.744389
09:44:03,0,2478,1037,-629.16375,0.792144,-627.580453,-630.746214
09:44:03,0,2478,1037,-629.16375,0.792144,-627.580453,-630.746214
09:44:04,500,2479,1037,-629.164306,0.79343,-627.579463,-630.748037
09:44:04,500,2479,1037,-629.164306,0.79343,-627.579463,-630.748037
09:44:04,0,2479,1037,-629.164722,0.794131,-627.577445,-630.751166
09:44:04,0,2479,1037,-629.164722,0.794131,-627.577445,-630.751166
09:44:06,884,2479,1037,-629.165139,0.794831,-627.57646,-630.752985
09:44:06,884,2479,1037,-629.165139,0.794831,-627.57646,-630.752985
09:44:06,500,2479,1037,-629.165556,0.795531,-627.575476,-630.754802
09:44:06,500,2479,1037,-629.165556,0.795531,-627.575476,-630.754802
09:44:06,0,2479,1037,-629.165972,0.796229,-627.574494,-630.756617
09:44:06,0,2479,1037,-629.165972,0.796229,-627.574494,-630.756617
09:44:07,0,2479,1037,-629.166389,0.796927,-627.573514,-630.758431

同一秒4,5个数据都有，这个时间，我用了currenttime和time都试过了。是什么原因，我们插入的公式调用的频率是怎么算的啊？