[Solved] Subset all rows by group by type

by


I would use indexing 

# save all the "transactions" where iteamtype equals "a" to an object called F  
f <-  df[ df$itemType %in% "a" , "transaction"  ]

#optional (look as f)
print(f)
print( unique(f))

# Subset to all the rows which equals one of the "transactions" stored in the object f
df[ df$transaction %in% unique( f ) ,   ]

3

solved Subset all rows by group by type