How to use Aggregate function in R

Question

can you help me please how to properly use aggregate function in R? I have data like this:

SPORT   FLOWS
[1,] \"Other\" \"1\"  
[2,] \"Other\" \"1\"  
[3,] \         


        

Answer 1

aggregate(FLOWS ~ SPORT, dat, function(x) sum(as.numeric(x)))

where dat is the name of your matrix.

Here, the function is.numeric is necessary to transform the second column into numbers.