我嘗試從每個長度減去另一個長度爲7的兩個向量。然而,我的結果不會產生另一個向量,我只是得到數字0和數據0.任何想法?R減去向量 - 數字0答案
#You will buy these stocks on rows/days 7, 8, 9, 15, 26, 33 and 53. (1 day after days apple dropped more than 2%)
#Assign the prices of the stocks on these days to a vector
SLB_buy = c(SLB_close[7],SLB_close[8],SLB_close[9],SLB_close[15],SLB_close[26],SLB_close[34],SLB_close[53])
SLB_buy
SLB.Close
2015-08-21 77.50
2015-08-24 73.87
2015-08-25 72.52
2015-09-02 75.41
2015-09-18 72.54
2015-09-30 68.97
2015-10-27 76.95
#You will sell these stocks on rows/days 10, 11, 12, 18, 29, 36 and 56. (3 day after purchase)
#Assign the prices of the stocks on these days to a vector
SLB_sell =c(SLB_close[10],SLB_close[11],SLB_close[12],SLB_close[18],SLB_close[29],SLB_close[36],SLB_close[56])
SLB_sell
SLB.Close
2015-08-26 70.09
2015-08-27 73.85
2015-08-28 76.06
2015-09-08 75.54
2015-09-23 71.94
2015-10-02 70.32
2015-10-30 78.16
#Your profit is equal to the sales price - buy price. Hence substract the previous vectors from each other.
SLB_sell - SLB_buy
Data:
numeric(0)
Index:
numeric(0)
能否請您編輯您的問題向我們展示了dput的'(SLB_sell)'結果和'dput(SLB_buy)'? –
另外,你可能想要做一些像'SLB_Buy = SLB_Close [c(7,8,9,15,26,34,53)]',所以你不必每次都想重新輸入'SLB_Close'一個新的條目。但是,確切的代碼取決於「SLB_Close」的對象類型。 –
這看起來像一個xts或動物園對象。你應該發佈'dput(SLB_buy)'和'dput(SLB_sell)',因爲R對象的打印表示對於它們的實際結構常常是不明確的。 –