I am working with a dataset which includes about 20000 study participants. Each study participant had multiple study visits, and each visit is a row of the dataset. In each row there is one column for the date, and then multiple columns for medications on that date (I have just included the first medication column… Read More How to subset a grouped dataframe when a date variable is repeated

As an example the file with following content: My dog My dog is running My dog is running fast A cat A cat is black A cat is black and small As a result I want to have only this two lines: My dog is running fast A cat is black and small I would… Read More How to delete lines if next line begins with the same content?

I have this df df = data.frame(x = c(1,1,2,2,3,4), y = LETTERS[1:6] ) The desired output is x y 1 1 A 2 1 B 3 2 C 4 2 D I tried using the filter finction but I haven’t got the result I am looking for. Thanks. >Solution : You can use n() by… Read More How to filter a dataframe based on the duplicated values?

I have a pandas dataframe which has duplicate rows of the column symbol and looks like this: df = | Index | Symbol | Column A | Column B | Status | |——-|———-|———-|———-|———-| | 0 | x | a | np.nan | Default | | 1 | y | d | c | Default |… Read More How to merge duplicate rows of a dataframe containing np.nan in different columns to one row with just the not nan values?

var removeDuplicates = function(nums) { for(let i=0; i<nums.length; i++){ for(let j=i+1; j<nums.length; j++){ if(nums[i]===nums[j]){ nums.splice(i,1); } } } }; this is my code for removing the duplicates, it works for number that are repeated twice but does not work for number that is repeated more than 2. Can anyone please tell me what is wrong… Read More removing duplicates from array in javascript

I’ve got a long list, each object of which is itself a list containing headers and data. Some of the objects are repeated. I’d like to find the repeated objects and remove them. Ideally this would find objects that are identical (name and contents). If both the name and contents are identical then the repeat… Read More Find repeated elements in a list and remove those objects

I have a dataframe which looks like this: ID Date EoM_Val Val ————————————— AAA 2021-06-30 3946750 3 AAA 2021-06-30 3946750 2 BBB 2021-06-30 2792182 6 BBB 2021-06-30 2792182 7 And basically, I want to only keep the the last EoM_Val based on the ID and Date columns, such that the final output looks like this:… Read More Replace duplicate values with Null and keep only last value

I have a dataframe that looks like this: col1 col2 col3 tn1 a b tn1 a c tn2 d b tn3 a b And I want to leave only those rows that are duplicated for col1 & col2, keeping BOTH rows: col1 col2 col3 tn1 a b tn1 a c I’ve been trying to do… Read More Only leave duplicated rows in a dataframe, with R

Im trying to select * from all duplicate rows in users, where a duplicate is defined as two users sharing the same first_name and last_name. (I need to process the other columns that might differ) Im using MySQL 8.0.28. My first try was to literally translate my requirement: select * from `users` AS u1 where… Read More more efficient way to select duplicate users

I need to remove duplicate or empty values (sets) from an array in javascript (typescript) if there is data with a non-empty value on the exact same date. If all the values (sets) were empty on that day, we should keep one value. Example: 0: (2) [‘2022-12-05’, null] —> Remove due to "Reason 1" 1:… Read More How to remove duplicates from array if value set for one of the duplicates, else hold null (javascript/typescript)