R lapply and unique -


i have list of dataframes called test , trying lowest ranking of month per accountid using lapply , unique. current code looks this, throwing error. causing problem?

test_1 <- lapply(test, function(x) unique(x[,list(x$ranking =  min(x$ranking), x$month), = x$accountid]))

when working 1 datatable (one datable 1 month), code below worked fine.

best_rank_mar <-  unique(rank_mar[,list(ranking=min(ranking), month), = accountid])


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