我有一些数据格式如下。我对此进行了一些分析，并希望能够在与分析数据相同的图表中绘制价格发展。这要求我对数据有相同的 x 轴。
所以我想以 150 个增量聚合“shares”列，并在其中添加“finalprice”和“time”。聚合应包括最新的时间和价格，因此如果需要在两行或多行数据上进行聚合，则最后一行应提供价格和时间数据。
我的问题是如何创建一个每行有 150 个共享的新向量。向量的长度将等于 sum(shares)/150。
是否有捷径可寻？提前致谢。
编辑：我考虑过使用 rep(finalprice, share) 扩展观察结果，然后获取扩展向量的每 150 个值。
数据样本：
"date","ord","shares","finalprice","time","stock"
20120702,E,2000,99.35,540.84753333,500
20120702,E,28000,99.35,540.84753333,500
20120702,E,50,99.5,542.03073333,500
20120702,E,13874,99.5,542.29411667,500
20120702,E,292,99.5,542.30191667,500
20120702,E,784,99.5,542.30193333,500
20120702,E,13300,99.35,543.04805,500
20120702,E,16658,99.35,543.04805,500
20120702,E,42,99.5,543.04805,500
20120702,E,400,99.4,546.17173333,500
20120702,E,100,99.4,547.07,500
20120702,E,2219,99.3,549.47988333,500
20120702,E,781,99.3,549.5238,500
20120702,E,50,99.3,553.4052,500
20120702,E,1500,99.35,559.86275,500
20120702,E,103,99.5,567.56726667,500
20120702,E,1105,99.7,573.93326667,500
20120702,E,4100,99.5,582.2657,500
20120702,E,900,99.5,582.2657,500
20120702,E,1024,99.45,582.43891667,500
20120702,E,8214,99.45,582.43891667,500
20120702,E,10762,99.45,582.43895,500
20120702,E,1250,99.6,586.86446667,500
20120702,E,5000,99.45,594.39061667,500
20120702,E,20000,99.45,594.39061667,500
20120702,E,15000,99.45,594.39061667,500
20120702,E,4000,99.45,601.34491667,500
20120702,E,8700,99.45,603.53608333,500
20120702,E,3290,99.6,609.23213333,500