Help with this much appreciated

 

I have a large dataframe that I would like to subset where the constraint

 

Test1 <- subset(df, date == uniques[[1]]), where uniques is a list of dates
that must be matched to create Test1.

 

I would like to perform an operation on Test1 that results in a single
column of data. So far so good.

 

How do loop through all values in the uniques list (say there is 50),
perform an operationon Test1,,,,Test50, and then bolt all the lists together
in a single list please ?

 

Regards

 

 

Glenn

 


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