Want to calculate conditional sum based on specified dates in r. My sample df is
start_date = c("7/24/2017", "7/1/2017", "7/25/2017")
end_date = c("7/27/2017", "7/4/2017", "7/28/2017")
`7/23/2017` = c(1,5,1)
`7/24/2017` = c(2,0,2)
`7/25/2017` = c(0,0,10)
`7/26/2017` = c(2,2,2)
`7/27/2017` = c(0,0,0)
df = data.frame(start_date,end_date,`7/23/2017`,`7/24/2017`,`7/25/2017`,`7/26/2017`,`7/27/2017`)
In Excel it looks like:
I want to perform calculations as specified in Column H which is a conditional sum of columns C through G based on the dates specified in columns A and B.
Apparently, Excel allows columns to be dates but not R.