Remove 'static' from combineFactorLevels, to use in 'melt'.
Remove 'static' from combineFactorLevels, to use in 'melt'.

jangorecki/data.table,jangorecki/data.table,Rdatatable/data.table,Rdatatable/data.table,vlulla/data.table,vlulla/data.table,vlulla/data.table,Rdatatable/data.table,jangorecki/data.table,Rdatatable/data.table,vlulla/data.table,jangorecki/data.table