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Method: [out] = groupby (obj, groupvars, aggcalcs)

Find groups in table data and apply functions to variables within groups.

This works like an SQL "SELECT ... GROUP BY ..." statement.

groupvars (cellstr, numeric) is a list of the grouping variables, identified by name or index.

aggcalcs is a specification of the aggregate calculations to perform on them, in the form {out_var, fcn, in_vars; ...}, where: out_var (char) is the name of the output variable fcn (function handle) is the function to apply to produce it in_vars (cellstr) is a list of the input variables to pass to fcn

Returns a table.