WebNov 16, 2012 · This List [Tuple2 [Char, Int]] gets mapped to the first element of the Tuple and then logic is applied to the new list of chars using distinct and size to check if the elements are the same and to retain those that only have one element. The filter filter (xs => xs.map (ys => ys._1).distinct.size != 1 xs.size == 1) Test data: WebDec 21, 2024 · So I have a list of tuple called tup_list: [ ('118', '35'), ('35', '35'), ('118', '202') Assuming the first element in each tuple is A, and the second is B, I am trying to filter my dataframe according to this tup_list, where the pairing needs to be the same. Original dataframe: A B 118 35 118 40 35 202 118 1 35 35
Filter a list of tuples in Haskell - Stack Overflow
Web1. filter list elements in list of tuples Using List comprehension and IN operator The first approach we are Using is List comprehension with IN operator and passing a condition … WebThe below code has been updated to match exact sub-lists in the list of tuples. Instead of pattern matching like in the example above, we take a far different approach here.. We start off by finding the head and tail of the filter list. We then find the the indices of where the head and tail occur in tup (we must reverse tup to find the tail_index, as index returns … scythe leopard
python - Filtering list of tuples based on condition - Stack …
WebMay 11, 2014 · Filter list of tuples in haskell. Ask Question Asked 8 years, 10 months ago. Modified 8 years, 10 months ago. Viewed 3k times 1 I'm trying to filter a list of tuples in haskell. I want to return the tuples where the first and the second element are the same. I'm trying this one. filter ((==fst).snd) [(1,2), (2,2), (3,3)] ... WebSep 2, 2024 · Filtering list of tuples based on condition Ask Question Asked 1 year, 6 months ago Modified 1 year, 4 months ago Viewed 6k times 21 For a given list of tuples, if multiple tuples in the list have the first element of tuple the same - among them select only the tuple with the maximum last element. For example: WebJun 25, 2024 · There’s no need for the intermediate tuple form. This will pattern match the struct, then filter, then output in the desired 2-tuple format. desired_names = ["A", "B"] for % {name: n, number: num} <- list_of_structs_with_tons_of_user_info, n in desired_names, do: {n, num} 6 Likes axelson June 25, 2024, 8:16pm 9 pdt775synfs owners manual