According to ?setkey, setkey() doesn't return any value. However, this was changed as of 1.6.5. https://r-forge.r-project.org/scm/viewvc.php/pkg/man/setkey.Rd?view=markup&root=datatable https://r-forge.r-project.org/scm/viewvc.php/pkg/NEWS?view=markup&root=datatable
Could be a bit confusing. Best, Muhammad
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