R remove duplicate rows based on two columns dplyr. Compare performance and handle special cases with ease.
R remove duplicate rows based on two columns dplyr Firstly I generate some random data to show my question Feb 9, 2021 · I have the following data frame with me in R (for anyone familiar with tidyverse, it's the starwars sample dataset) I'm trying to create a tibble that outputs two columns: homeworld, and shortest_5 ( May 16, 2024 · Learn how to effectively remove duplicates in R using unique(), duplicated(), and distinct() functions. Jul 7, 2012 · I'd like to subset a dataframe to include only rows that have unique combinations of three columns. There are many duplicates within the dataframe where the majority of info is the same but one or two pieces dif Jan 23, 2025 · Learn how to efficiently remove rows in R using base R, dplyr, and data. In this case, we use key as the argument. In this example, we look for a columns that contain the word color to use when finding distinct rows. Aug 8, 2022 · I want to remove both (all) sets of duplicate rows within a dataframe, where rows are duplicated by some but not all columns. Nous parlons en anglais et en français. This can handle while using different functions in The post How to Remove Duplicates in R with Example appeared first on finnstats. It allows you to select, remove, and duplicate rows. I can do this separately per strategy. The following syntax explains how to find duplicate rows in two data frames using the inner_join function of the dplyr add-on package. By combining these two functions, we can detect and examine the duplicate entries in the data frame. So the resultant dataframe will not have any duplicates. I want to perform a left join such that the combined dataframe has columns id, a, b, c. Say goodbye to messy spreadsheets and hello to streamlined data management! Oct 10, 2017 · I want to remove duplicate rows in my data. To avoid redundant data, we must remove duplicates from a data frame. It is the same problem than here : R, conditionally remove duplicate rows (Similar one: Remove duplicates based on 2nd column condition) However, you can also see that we have returned the first row of each value in x. This also includes posts focusing on meme concepts (even when created in Minecraft) and "shitposting". I expect about 300 duplicates. In this comprehensive guide, we will cover several methods to remove duplicate rows from data frames in R using base R functions and the dplyr package. I would like to remove the duplicates under a condition: keeping the row with the smallest value in column 3. Distinct can remove duplicate rows from a data frame when presented with a specific column. Mar 30, 2015 · I have a dataframe which contains entries identified by an application number "Apno". when running the code just once). By default, merge () identifies Jul 7, 2015 · 0 I have a 3-columns data. All duplicates in the variable x1 have been summed up in the variable x2. Compare performance and handle special cases with ease. Since you can't change them because you're grouping by them, you can create new columns without the duplicates. You can use if_any () or if_all () depending on whether you want to filter rows where at least one or all of the selected columns satisfy a condition. This is the place for most things Pokémon on Reddit—TV shows, video games, toys, trading cards, you name it! Oct 19, 2023 · 📑 Other Treasures 📁 Awesome Piracy 📁 Champagne Piracy Wiki 📁 EverythingMoe 📁 FMHY 📁 Ripped 📁 The Index 📁 Wotaku ⚓ Return to r/Piracy 💀 Return to Wiki Last revised by sunbrothersco 1 year ago Reddit is a network of communities where people can dive into their interests, hobbies and passions. data. Identifying and removing duplicate rows is an essential step in data cleaning to improve data quality. Excessive server names in screenshots or videos is also considered advertising. Write Cleaner Code with dplyr: If you like tidy code, use dplyr::distinct (). I'd like to do something like the following, but with I am trying to remove duplicate rows from a data frame based on the max value on a different column So, for the data frame: These functions provide a framework for modifying rows in a table using a second table of data. Nov 7, 2023 · Using the dplyr package in R, you can remove rows from a dataset by using the filter () function. R's duplicated returns a vector showing whether each element of a vector or data frame is a duplicate of an element with a smaller subscript. In order to apply the functions of the dplyr package, we first need to install and load dplyr: CHEATSHEET dplyr functions work with pipes and expect tidy data. Method 1: distinct () This function is used to remove the duplicate rows in the dataframe and get the unique data Syntax: distinct (dataframe) We can also remove duplicate rows based on the multiple columns/variables in the dataframe Syntax: Feb 24, 2025 · The dplyr::distinct () function in R removes duplicate rows from a data frame or tibble and keeps unique rows. rows_insert() adds new rows (like INSERT). Feb 15, 2022 · In this article, we will discuss how to remove duplicate rows in dataframe in R programming language. Jan 23, 2025 · Learn how to efficiently remove rows in R using base R, dplyr, and data. For example, if the same row appears three times in a data frame, we must remove two rows because they are duplicates of one original row. slice_sample() randomly selects rows. Nov 1, 2020 · In this R tutorial, you will learn how to remove duplicates from the data frame. Using R. After specifying the conditions, the rows that match the conditions will be removed from the dataset. If . Filter out all rows from original df that match the vector , using %in% versus == You may need to break step 4 into 2 steps, where first you use that match to mutate a new column where match = 1 and no match =0. This tutorial describes how to identify and remove duplicate data in R. In this article, we are going to see how to identify and remove duplicate data in R. In this article, I will explain all these examples by using functions from R base, dplyr, and data. May 5, 2025 · Eliminate redundant data with ease using the 'r delete duplicate rows' function. I want to delete duplicate rows so that I only have one row per date, I want to do this based on the Depth, I would like to keep the row with the greatest (deepest) depth. Our goal is to remove duplicate entries in the sequence column, keeping only the row with the highest Removing duplicates based on a single variable Removing duplicates based on the combination of multiple variables Conclusion Sometimes you may encounter duplicated values in the data which might cause problems depending on how you plan to use the Sep 25, 2018 · I'd like to create a new list with duplicate entries based upon an existing list in R. Each df has multiple entries per month, so the dates column has lots of duplicates. Aug 25, 2021 · How to Remove Duplicates in R, when we are dealing with data frames one of the common tasks is the removal of duplicate rows in R. e. So if rows 3, 4, and 5 of a 5-row data frame are the sa I would like to select a row with maximum value in each group with dplyr. There are other methods to drop duplicate rows in R one method is duplicated () which identifies and removes duplicate in R. Do not hesitate to message the mods if you experience any issues! If it's related to the NFL, but not about the NFL (such as streams, betting-related posts, video games, Fantasy Football, College Football, or NFL-related jokes), please check the sidebar. On top of that, I want y == "condition_one" This short R tutorial explains how to simply delete duplicate rows in a data table (data. Example 1: Create Duplicate of Column Using Base R The following R code illustrates how to replicate a data frame variable in a data frame with a new name. As such, please use this megathread as a ground to discuss this hot topic, share relevant videos, and discuss the topic of net neutrality. Example 2: Consolidate Duplicate Rows Using group_by () & summarise () Functions of dplyr Package The following code shows how to use the dplyr package to sum up duplicates. Check out r/Karma4Free if you're really desperate. How to duplicate data frame rows in R - Base R vs. The frame has a mix of discrete continuous and categorical variables. This function takes a data frame as input and returns a logical vector which can be used to subset the data frame. You can instruct R to search for duplicates based only on specific columns, such as CustomerID or Email, giving you complete control over your data cleaning. This function works like dplyr::distinct() in its handling of arguments and data-masking but returns duplicate rows. I want to remove duplicate values based upon matches in 2 columns in a dataframe, v2 & v4 must match between rows to be removed. Jul 23, 2025 · The distinct() function from the dplyr package in R is used to identify and return unique rows or combinations of values based on specified columns. Further Welcome to Canada’s official subreddit! This is the place to engage on all things Canada. Reddit's sitewide content policy applies to r/premed. Complete guide with practical examples for data cleaning and manipulation. Dec 20, 2012 · The function distinct() in the dplyr package performs arbitrary duplicate removal, either from specific columns/variables (as in this question) or considering all columns/variables. You can provide additional arguments, like columns, to check for duplicates in those specific columns. Jul 25, 2025 · Explore multiple R methods to remove duplicate rows from dataframes, focusing on base R, dplyr, data. 2col, when distinct is applied to remove duplicat Mar 22, 2019 · You can use dplyr to group by the columns with duplicate values you want to remove. Syntax: We can also remove duplicate rows based on the multiple columns/variables in the dataframe. It is accompanied by a number of helpers for common use cases: slice_head() and slice_tail() select the first or last rows. Nov 7, 2021 · In this tutorial, you will learn how to remove a row in R. Syntax: Dataset in use: Jul 21, 2021 · In this article, we are going to remove duplicate rows in R programming language using Dplyr package. B, DISTANCE). table methods. table. Jul 23, 2025 · In this case, we just have to pass the entire dataframe as an argument in distinct () function, it then checks for all the duplicate rows for all variables/columns and removes them. Next, the output of the previous operation is Jul 12, 2025 · A dataset can have duplicate values and to keep it redundancy-free and accurate, duplicate rows need to be identified and removed. In this cheat sheet, you'll find a handy list of functions covering dplyr functions —all collected from our Data Manipulation with Aug 4, 2018 · 29 I'm an R newbie and am attempting to remove duplicate columns from a largish dataframe (50K rows, 215 columns). You will learn how to use the following R base and dplyr functions: R base functions duplicated(): for identifying duplicated elements and unique(): for extracting unique elements, distinct () [dplyr package] to remove duplicate rows in a data frame. In certain situations in can be much faster than data %>% group_by() %>% filter(n() > 1) when there are many groups. When working with large data set and extracting replicated rows, utilize the dplyr package’s distinct () function. My situation is similar to the one presented in this question, but I'd like to preserve the other Apr 12, 2024 · Remove rows with dplyr based on two conditions of two variables in R Asked 1 year, 7 months ago Modified 1 year, 7 months ago Viewed 90 times Dec 16, 2022 · I would like to remove all duplicate rows from a dataframe which contains tibbles in one column without using the package dplyr. Aug 14, 2022 · Dplyr is one of the most widely used tools in data analysis in R. Jul 23, 2024 · Assume you have a dataframe named df with multiple columns, including sequence and value. Unfortunately, the issue of diminished or destroyed net neutrality is one that threatens r/Videos as well as the internet in its entirety. As I am new to tibbles and handling them, I need your help. data is a grouped_df, the I am trying to remove duplicate rows from a data frame based on the max value on a different column So, for the data frame: These functions provide a framework for modifying rows in a table using a second table of data. However, here's another approach that uses the slice() function from dplyr. Jan 11, 2025 · removes duplicates based solely on the combination of these columns, allowing you to retain nuance in multi-variable datasets. Jun 14, 2019 · Viewed 653 times Part of R Language Collective 2 This question already has answers here: Keep only non-duplicate rows based on a Column Value [duplicate] (1 answer) Finding ALL duplicate rows, including "elements with smaller subscripts" (10 answers) How can I remove all duplicates so that NONE are left in a data frame? (3 answers) Nov 7, 2023 · Using the dplyr package in R, you can remove rows from a dataset by using the filter () function. By default, all columns are considered when duplicates are evaluated - rows returned by the function are 100% duplicates In the context of removing duplicate rows, there are three functions from this package that are of our interest: duplicated (), unique () and distinct () duplicated () identifies rows which values appear more than once. People who are related to the NFL have lives outside of their organization as well, and in the majority of instances these are best discussed in the subreddit associated with their particular team. The dplyr package provides functions to perform these operations using simple syntax. May 28, 2024 · There are multiple ways to get the duplicate rows in R by removing all duplicates from a single column, selected columns, or all columns. Neither data frame has a unique key column. Part of the tidyverse, it provides practitioners with a host of tools and functions to manipulate data, transform columns and rows, calculate aggregations, and join different datasets together. A generally uplifting subreddit. You will als learn how to remove multiple rows & based on conditions etc. May 12, 2017 · I'd like to remove rows corresponding to a particular combination of variables from my data frame. frame according to the gender column in my data set. Jan 29, 2025 · Duplicate rows refer to all the values across all columns that are the same in two or more rows. Please be respectful of each other when posting, and note that users new to the subreddit might experience posting limitations until they become more active and longer members of the community. There's a community for whatever you're interested in on Reddit. We can remove rows from the entire which are duplicates and also we cab remove duplicate rows in a particular column. Yes, really. Most of the time, the best solution is using distinct() from dplyr, as has already been suggested. Several examples of how to use this function are provided so users can understand the syntax and apply it to their own data. fduplicates2() returns the same output but uses a different method which utilises joins and is written almost May 16, 2024 · Learn how to effectively remove duplicates in R using unique(), duplicated(), and distinct() functions. Nov 7, 2023 · In R, there is a built-in function called duplicated () which can be used to identify and remove duplicate rows from a data frame. Examine duplicate rows To quickly review rows that have duplicates, you can use get_dupes() from the janitor package. library(dplyr) mtcars %>% mutate(cyl. I know there has been a similar question asked (here) but the difference here is that I would like to remove duplicate rows within each subset of the data set, where each subset is defined by an unique id. The closest equivalent of the key column is the dates variable of monthly data. See full list on statology. dplyr package - 2 R programming examples - R programming tutorial - Detailed programming code in RStudio Jul 10, 2019 · The code used above is great for deleting columns, but I am wondering if there is a similar function I can use in dplyr or tidyverse to delete rows, not just columns. Example: Subset of Unique Rows with Highest Values in Column The following R programming syntax explains how to return the highest value in y for each duplicate in x. A, ID. My data is ~1000 rows x 20 columns. For the next step in our tutorial, we’re going to talk about adding and removing rows. This consists in filtering for items that are duplicated in a group, but also Example 2: Remove Duplicate Rows Using dplyr The following code shows how to remove duplicate rows from a data frame using the distinct () function from the package: Jul 15, 2025 · Data manipulation in R involves cleaning, transforming, and organizing data to make it suitable for analysis. The functions are inspired by SQL's INSERT, UPDATE, and DELETE, and can optionally modify in_place for selected backends. First, you will learn how to delete duplicated rows and, second, you will remove columns. Jan 13, 2022 · I'm trying to drop duplicates and keep the row with the maximum values. slice() lets you index rows by their (integer) locations. table are all okay for me to use. Nov 13, 2023 · I am trying to deduplicate a data set based on distinct values that appear in two columns, an example data set My question is for second result, df. This is similar to unique. This function is used to remove the duplicate rows in the dataframe and get the unique data. Jan 28, 2025 · Learn how to remove duplicate rows in R using base R, dplyr, and data. It facilitates the integration of datasets by aligning and merging rows with matching values in specified columns. The column x1 is an integer and the column x2 has the character class. 15. To find people to play with, try r/mcservers, r/realms or r/MinecraftBuddies; please don’t provide server addresses or invite links here. It also show how to handle duplicate elements in a vector. I'm trying to use tidyverse as much as possible, so dplyr would be preferred. frame() but considerably faster. Complete guide with practical examples and best practices for data cleaning. Welcome! /r/MadeMeSmile is a place to share things that made you smile or brightened up your day. org Sep 2, 2023 · If you are working with a data frame in R and want to remove duplicate rows based on specific columns, the dplyr package is here to help! In this blog post, we'll explore how to efficiently use dplyr to remove duplicate rows, address common issues, and provide easy solutions. Here's a dummy data : Remove duplicate rows based on multiple columns using Dplyr in R在本文中，我们将学习如何在 R 编程语言中使用 dplyr 删除基于多列的重复行。 Feb 26, 2025 · The dplyr across () function is helpful when filtering based on multiple columns. Official Reddit Page and Subreddit for the Houston Texans To gain karma, post comments on other subreddits and gain upvotes. Dec 9, 2024 · The filter () function selects rows according to a specific column value, while the mutate () function alters another column by replacing certain values. Feb 2, 2024 · Use group_by, filter and duplicated Functions to Remove Duplicate Rows by Column in R Another solution to remove duplicate rows by column values is to group the data frame with the column variable and then filter elements using filter and duplicated functions. Comprehensive guide with practical examples and performance comparisons for R programmers. cols)) there are a couple other options for dropping columns using select() that do not involve defining all the specific column names (using the dplyr starwars sample data for some more variety in column names): If we would like to select multiple columns based on conditions, we can use dplyr select helpers. The video shows three options to deal with identical duplicated data entries: Duplicated Jun 9, 2024 · In our data-wrangling, we've explored two primary methods for removing rows from DataFrames: base R functions and the dplyr package. Sep 6, 2025 · Learn how to use dplyr distinct () in R to remove duplicates, keep unique rows, and clean datasets for accurate, reliable analysis. Specifically, we will look at how to remove duplicate records from the data frame using 1) base R, and 2) dplyr. Sep 18, 2018 · Hello, I am trying to join two data frames using dplyr. This includes no spam, vote manipulation, ban evasion, or community interference. Can you help Aug 12, 2022 · This tutorial explains how to select unique rows from a data frame in R, including several examples. Any ideas? Dec 24, 2023 · Combinations such as A and B in row 1 are the same to me as combinations such as B and A, where values in column value are also the same. dplyr is part of the tidyverse. Aug 12, 2022 · This tutorial explains how to select unique rows from a data frame in R, including several examples. May 6, 2020 · 10 Consider two dataframes, df1 and df2. Common dplyr Functions Some of the key Nov 12, 2021 · I need to collapse a large table (5M by V19) where I remove duplicates based on a specific column (V1), combine the values of all other columns if unique (if not, then report the result only once). frame) in RStudio. The below comes close to what I want, but it requires the entire row to Jun 14, 2019 · Viewed 653 times Part of R Language Collective 2 This question already has answers here: Keep only non-duplicate rows based on a Column Value [duplicate] (1 answer) Finding ALL duplicate rows, including "elements with smaller subscripts" (10 answers) How can I remove all duplicates so that NONE are left in a data frame? (3 answers) Closing Words To extract the duplicate elements or remove rows from data frame or vector, utilize the base functions like duplicated () or unique () method. r/pokemon is an unofficial Pokémon fan community. This is the place for most things Pokémon on Reddit—TV shows, video games, toys, trading cards, you name it! Oct 19, 2023 · 📑 Other Treasures 📁 Awesome Piracy 📁 Champagne Piracy Wiki 📁 EverythingMoe 📁 FMHY 📁 Ripped 📁 The Index 📁 Wotaku ⚓ Return to r/Piracy 💀 Return to Wiki Last revised by sunbrothersco 1 year ago Thanks to dplyr we’re able to take a different approach to their contents. Nov 8, 2023 · Duplicate rows in a data frame can affect the results of data analysis and models in R. 2 Deduplication This section describes how to review and remove duplicate rows in a data frame. In the following example, I’ll explain how to extract rows conditionally based on another column. Find duplicated rows (based on 2 columns) in Data Frame in R Asked 14 years, 3 months ago Modified 1 year, 3 months ago Viewed 144k times Dplyr package in R is provided with distinct () function which eliminate duplicates rows with single variable or with multiple variable. However, when trying to do this based on two separate conditionals based on the strate Jun 15, 2025 · cleaned_df <- df [!duplicated (df), ] Define Your Own Duplicates: You don't have to check the entire row. It includes tasks like selecting, filtering, sorting, and creating new variables, often done using the dplyr package for simple and efficient operations. # Load dplyr library Mar 7, 2016 · Beyond select(-one_of(drop. Can you help I want to remove duplicate values based upon matches in 2 columns in a dataframe, v2 & v4 must match between rows to be removed. Jul 21, 2021 · In this article, we are going to remove duplicate rows in R programming language using Dplyr package. How can I remove rows which for my purpose are duplicates? As you can see based on Table 1, our example data is a data frame containing six rows and two columns that are named “x1” and “x2”. This time around we redefine ourFrame2 through dplyr’s distinct function. Syntax: distinct (dataframe Aug 27, 2018 · I have a dataframe with multiple variables, and I am interested in how to subset it so that it only includes the first duplicate. frame (variables: ID. dup = cyl[duplicated(cyl) | duplicated(cyl, from. table, and sqldf, with practical code examples and performance considerations. Each approach brings its strengths and weaknesses to the table. Feb 20, 2019 · I have been trying for a while now to solve a problem close to the one as presented at this issue with no success. This powerful tool efficiently identifies and removes duplicate entries, ensuring your dataset is clean and organized. I was able to find a solution from Stack Overflow, but I am having a really difficult time understanding that solution. slice_min() and slice_max() select rows with the smallest or largest values of a variable. It is particularly useful in data cleaning and exploratory data analysis to remove duplicates and ensure accurate data representation. Syntax: distinct (dataframe May 6, 2020 · 10 Consider two dataframes, df1 and df2. Sep 29, 2022 · This tutorial explains how to replicate rows in a data frame in R, including several examples. last = TRUE)]) approach? Oct 19, 2023 · Moreover, when I run the same code above again after the first duplicate removal attempt, it keeps deleting more rows which is confusing because I thought all duplicate rows should be deleted in one attempt (i. last = TRUE)]) How can I convert code presented here to find ALL duplicated elements with dplyr? My code above just throws an error? Or even better, is there another function that will achieve this more succinctly than the convoluted x[duplicated(x) | duplicated(x, from. Jan 30, 2025 · Learn how to effectively remove duplicate rows in R using both Base R and dplyr methods. library( Nov 27, 2023 · Overview The merge () function in R is a versatile tool used for combining data frames based on common columns. r/Videos attempts to avoid directly political content when possible, so much so that it is our Second Rule. Aug 26, 2021 · This tutorial explains how to remove rows from a data frame in R using dplyr, including several examples. The two tables are matched by a set of key variables whose values typically uniquely identify each row. The first step is done with the group_by function that is part of the dplyr package. This targeted approach helps streamline data in preparation for further manipulation or visualization tasks. In tidy data: Union Function in R : UNION function in R combines all rows from both the tables and removes duplicate records from the combined dataset. To be able to use the functions of the dplyr package, we first have to install and load dplyr:. Renaming Columns How To Add and Remove Rows How to Merge Two Data Frames So we’ve shown you how to create and perform basic manipulations on a data frame object using R, including adding and removing data columns and calculated fields. Mar 16, 2021 · But I want R to return ALL the non-unique rows, not only the one where the duplicate value first occured (which is happening with duplicate()). Reddit is a network of communities where people can dive into their interests, hobbies and passions. Dataset in use: Method 1: Using distinct () This method is available in dplyr package which is used to get the unique rows from the dataframe. By default, key values in y The duplicated () function identifies the duplicate rows in the data frame, while the table () function creates a frequency table of the duplicate values. Keep only unique/distinct rows from a data frame. df1 has columns id, a, b. This function allows you to specify the conditions that you want to filter by, such as certain column values or specific row numbers. This function supports various types of joins, such as inner, outer, left, and right joins, allowing users to control how data is merged. Base package, dplyr, or data. df2 has columns id, a, c. sxmqvrwfcfjjbfdeybmxtxvmfxnlmvbgzxtgexeucdjxahpwheqkovfyrxxxoswpolfbkkzddpbjti