[R] Using Aggregate() with FUN arguments, which require more than one input variables

[RNoob]

Dear all,

I am trying to apply the aggregate() function to calculate correlations for
subsets of a dataframe. My argument x is supposed to consist of 2 numerical
vectors, which represent x and y for the cor() function. 

The following error results when calling the aggregate function: Error in
FUN(X[[1L]], ...) : supply both 'x' and 'y' or a matrix-like 'x'. I think
the subsets aggregate puts into cor() are sort of list types and therefore
can't be handled by cor().

Can anyone provide me with a solution?

Regards,
RNoob

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