Hello ! I don't understand the fonction aggregate and really need your help !
I have a table with three columns : "distance", "specie", "number".
We are supposed to use aggregate to find the mean of "number" for each different "specie" at each different "distance".
I tried so many things I start believing our teacher forgot to give us another hint !
Thanks for reading 
Hi @SF_Crisis! Since your question seems related to an educational assigment, I'll try to avoid providing you a complete solution, but rather a hint:
The aggregate function has an argument (by) that takes the values of the variable you are using to group the data. These values have to be provided as a list (for example, by = list(grouping_variable)). You may find some additional help here.
I hope you find this a bit useful.
Good luck!
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