The "duplicates" tag concerns detecting and/or dealing with multiple instances of items in collections.
I have read a CSV file into an R data.frame. Some of the rows have the same element in …
r duplicates r-faqI need to take a C++ vector with potentially a lot of elements, erase duplicates, and sort it. I currently …
c++ sorting vector stl duplicatesThe pandas drop_duplicates function is great for "uniquifying" a dataframe. However, one of the keyword arguments to pass is …
python pandas duplicates drop-duplicatesI have been working with a string[] array in C# that gets returned from a function call. I could possibly …
c# arrays duplicatesHow could I go about detecting (returning true/false) whether an ArrayList contains more than one of the same element …
java arrays arraylist duplicatesFor example, given the list ['one', 'two', 'one'], the algorithm should return True, whereas given ['one', 'two', 'three'] it should …
python string list duplicatesI want to have a map with duplicate keys. I know there are many map implementations (Eclipse shows me about 50), …
java duplicates guava multimapI have a list of items that likely has some export issues. I would like to get a list of …
python pandas duplicatesinsert into table select * from table where primarykey=1 I just want to copy one row to insert into the same …
mysql copy duplicates rowI have a Ruby array which contains duplicate elements. array = [1,2,2,1,4,4,5,6,7,8,5,6] How can I remove all the duplicate elements from this …
ruby-on-rails arrays ruby duplicates