duplicates

I'm trying to debug a portion of code for an assignment (I'm still very new to Java) and have combed through many resources to solve this conflict but still can't quite work it out. public static void main(String [] args){ Scanner keyboard = new Scanner(System.in); String input = null; do { System.out.println("Enter 'A' for option A or 'B' for option B."); String input = keyboard.next(); input.toLowerCase(); input.charAt(0); } while ((input != "a") || (input != "b")); } I always get a Duplicate Local Variable error with the input String. Any help would be greatly appreciated! replace String

I am trying to figure out how to remove all unique rows, from a data frame, but if it has a duplicate, I want that to stay in. For Example - I want all columns from this with col1 the same: df<-data.frame(col1=c(rep("a",3),"b","c",rep("d",3)),col2=c("A","B","C",rep("A",3),"B","C"),col3=c(3,3,1,4,4,3,2,1)) df col1 col2 col3 1 a A 3 2 a B 3 3 a C 1 4 b A 4 5 c A 4 6 d A 3 7 d B 2 8 d C 1 subset(df,duplicated(col1)) col1 col2 col3 2 a B 3 3 a C 1 7 d B 2 8 d C 1 But I want to have rows 1,2,3,6,7,8 since they all have the same col 1. How do I get 1 and 6 to be included? Or, conversely, how do I

I have an array that looks like this: 1. coordinates = [ [16.343345, 35.123523], 2. [14.325423, 34.632723], 3. [15.231512, 35.426914], 4. [16.343345, 35.123523], 5. [15.231512, 32.426914] ] The latitude on line 5 is the same as on line 3, but they have different longitudes and are therefore not duplicates. Both the latitude and longitude are the same on line 3 and 6, and are therefore duplicates and one should be removed. The difficulty in this question that different arrays never compare equal even if they contain same values. Therefore direct comparison methods, like indexOf won't work. The

ok, so I have an object like: var myobject = { "field_1": "lorem ipsum", "field_2": 1, "field_2": 2, "field_2": 6 }; as you see there are duplicate names in the object, but with different values. If i go through it like (using jQuery): $.each(myobject, function(key, value) { console.log(key); console.log(myobject[key]); console.log(myobject[value]); } key - returns the correct key myobject[key] - returns the name for that key myobject[value] - returns the last elements', with that name, value meaning for field_2 it will return 6, though it'll print it 3 times, as it repeats 3 times in the

I want to remove duplicate values based upon matches in 2 columns in a dataframe, v2 & v4 must match between rows to be removed. > df v1 v2 v3 v4 v5 1 7 1 A 100 98 2 7 2 A 100 97 3 8 1 C NA 80 4 8 1 C 78 75 5 8 1 C 78 62 6 9 3 C 75 75 For a result of > df v1 v2 v3 v4 v5 1 7 1 A 100 98 2 8 1 C NA 80 3 8 1 C 78 75 4 9 3 C 75 75 I know I want something like: df[!duplicated(df[v2] && df[v4]),] but this doesn't work. Wyldsoul This will give you the desired result: df [!duplicated(df[c(1,4)]),] 来源： https://stackoverflow.com/questions/34909489/remove-duplicate-values-based-on-2-columns

I have this cell array in MATLAB: y = { 'd' 'f' 'a' 'g' 'g' 'a' 'w' 'h'} I use unique(y) to get rid of the duplicates but it rearranges the strings in alphabetical order: >> unique(y) ans = 'a' 'd' 'f' 'g' 'h' 'w' I want to remove the duplicates but keep the same order. I know I could write a function do do this but was wondering if there was a simpler way using unique to remove duplicates while keeping the same order just with the duplicates removed. I want it to return this: >> unique(y) ans = 'd' 'f' 'a' 'g' 'w' 'h' gnovice Here's one solution that uses some additional input and output