Extracting Data

Extracting rows based of values (time)
index = testframe$Date>="1992-02-28" & testframe$Date<="1994-03-09" testframe[index, 3:5] <- testframe[index, 3:5] * 3

Extracting rows based on a list
Data= Data[Data$Date %in% date_list,]

Select columns by name
Climate_Select = select(Climate,                        TMK, TXK, TNK,                         FX, RSK, SDK,                         PM, UPM)