r flatten list in data framer flatten list in data frame

Logical scalar passed to unlist Get a list from Pandas DataFrame column headers. Thus the conversion between your input list and a 30 x 132 data.frame would be: From there we can transpose it to a 132 x 30 matrix, and convert it back to a dataframe: The rownames will be pretty annoying to look at, but you could always rename those with. See below. There is one difference with @Alex Brown's solution compared to yours, going your route yielded the following warning message for some reason: `Warning message: In data.row.names(row.names, rowsi, i) : some row.names duplicated: 3,4 --> row.names NOT used'. Asking for help, clarification, or responding to other answers. Content Discovery initiative 4/13 update: Related questions using a Machine flatten list column within dataframe in R, Transforming a list in a dataframe to a character, Sort (order) data frame rows by multiple columns. Note that fill = NA has been specified because it defaults to fill = NA_character_, which would otherwise coerce all the values to character. I.e. list. Connect and share knowledge within a single location that is structured and easy to search. Convert all elements to data frames or To subscribe to this RSS feed, copy and paste this URL into your RSS reader. You can check with. Tx, plyr is being deprecated in favour of dplyr. It can take a list of lists, data.frames or data.tables as input. Only caveat is that if the column names already contain ". How do two equations multiply left by left equals right by right? I could you explain a little how that works? As Ananda Mahto pointed out in a comment, sapply(b, length) can be replaced with lengths(b) in the most recent version of R (3.2, if I'm not mistaken). Convert DataFrame to Matrix with Column Names in R, Convert dataframe rows and columns to vector in R. A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. For the general case of deeply nested lists with 3 or more levels like the ones obtained from a nested JSON: consider the approach of melt() to convert the nested list to a tall format first: followed by dcast() then to wide again into a tidy dataset where each variable forms a a column and each observation forms a row: More answers, along with timings in the answer to this question: It might be easier, and more useful, to extract all of the data. are removed. Not downvoting. Nice work! The package data.table has the function rbindlist which is a superfast implementation of do.call(rbind, list()). some slight improvements. Now you can run. Usually a list. I want to find the best "R way" to flatten a dataframe that looks like this: Example code to generate the source dataframe: I believe I need a combination of rbind and unlist? Unfortunately, in its present form, this function is not vectorized across columns, so you would need to nest the calls to listCol_w for each column that needs to be flattened. What is the etymology of the term space-time? Also take care if you have character data type - data.frame will convert it to factors. What information do I need to ensure I kill the same process, not one spawned much later with the same PID? We can use this property to define keys of interest and extract them in separate list using lapply. How can I pretty-print JSON using node.js? flatten_dfr() and flatten_dfc() return data frames created by collecting information from list-like objects into a If you really want to convert back to a data.frame use as.data.frame(DT). Sort (order) data frame rows by multiple columns. My data frame contains the output of a survey with a select multiple question type. What kind of tool do I need to change my bottom bracket? Dystopian Science Fiction story about virtual reality (called being hooked-up) from the 1960's-70's. Logical scalar indicating whether a data Works great for me! I'll switch to what you've written. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. acknowledge that you have read and understood our, Data Structure & Algorithm Classes (Live), Data Structures & Algorithms in JavaScript, Data Structure & Algorithm-Self Paced(C++/JAVA), Full Stack Development with React & Node JS(Live), Android App Development with Kotlin(Live), Python Backend Development with Django(Live), DevOps Engineering - Planning to Production, GATE CS Original Papers and Official Keys, ISRO CS Original Papers and Official Keys, ISRO CS Syllabus for Scientist/Engineer Exam, Interview Preparation For Software Developers. They require dplyr to How do I replace NA values with zeros in an R dataframe? A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. How do I make a flat list out of a list of lists? rbind is used to bind the lists together by row into data frame. Methods for making an object flat, such as Extending on @Marek's answer: if you want to avoid strings to be turned into factors and efficiency is not a concern try. The list method of flatten is based on By using our site, you I corrected it. How do I select rows from a DataFrame based on column values? And how to capitalize on that? Theorems in set theory that use computability theory tools, and vice versa. Very small data set so performance is not an issue - thanks! Convert Nested lists to Data Frame by Column. Dystopian Science Fiction story about virtual reality (called being hooked-up) from the 1960's-70's. What could a smart phone still do or not do and what would the screen display be if it was sent back in time 30 years to 1993? The contents of the list can be anything for I would like to flatten out the list to obtain the following output: should be easy but somehow I can't find the search terms. @RichieCotton It's not right example. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, How large are your 'real' data (is performance an issue?). Finding valid license for project utilizing AGPL 3.0 libraries. from the base package. to get a data.frame back, you'd probably better use: Flatten list column in data frame with ID column, The philosopher who believes in Web Assembly, Improving the copy in the close modal and post notices - 2023 edition, New blog post from our CEO Prashanth: Community is the future of AI. Nice work. As of R 3.2 there is lengths to replace sapply(x, length) as well. Works well unless the list has only one element in it: Instead of using the base function "Reduce" you can use the purr function "reduce" as in: For my list with 30k items, rbindlist worked way faster than ldply. All the data types (character, numeric, etc) are correctly transformed. @sbha I tried to use df <- purrr::map_df(l, ~.x) but it seems like its not working , the error message i have is Error: Column, I think reshape2 is being deprecated for dplyr, tidyr, etc. inconsistent. Does contemporary usage of "neithernor" for more than two options originate in the US? type for the other functions. We are going to apply the flatten function for the above code. I was researching this question the last couple of days. Although it looks similar to other solutions, it uses rbind.fill from the plyr package. What is the most efficient way to cast a list as a data frame? row-binding and column-binding respectively. map_names, map_values, For your example with different-length input where it fails, it's not clear what the desired result would be @Gregor True, but the question title is "R - list to data frame". Then you can make the following modification. thanks. For more information on customizing the embed code, read Embedding Snippets. Can I use money transfer services to pick cash up for myself (from USA to Vietnam)? This gets around the problem of the long variable names by simply extracting the names to a new data frame variable, spreading the attributes using these names, and then unnesting the values: Which will return a data frame like the following: Based on and inspired from your answers, I use the following pipe now. Optional arguments passed to and from other Content Discovery initiative 4/13 update: Related questions using a Machine recursively change names in nested lists in R. How can I pretty-print JSON in a shell script? Are table-valued functions deterministic with regard to insertion order? acknowledge that you have read and understood our, Data Structure & Algorithm Classes (Live), Data Structures & Algorithms in JavaScript, Data Structure & Algorithm-Self Paced(C++/JAVA), Full Stack Development with React & Node JS(Live), Android App Development with Kotlin(Live), Python Backend Development with Django(Live), DevOps Engineering - Planning to Production, GATE CS Original Papers and Official Keys, ISRO CS Original Papers and Official Keys, ISRO CS Syllabus for Scientist/Engineer Exam, Interview Preparation For Software Developers, Split large R Dataframe into list of smaller Dataframes. Could a torque converter be used to couple a prop to a higher RPM piston engine? rightBarExploreMoreList!=""&&($(".right-bar-explore-more").css("visibility","visible"),$(".right-bar-explore-more .rightbar-sticky-ul").html(rightBarExploreMoreList)), Python program to Flatten Nested List to Tuple List, Split large Pandas Dataframe into list of smaller Dataframes, Python Program to Flatten a Nested List using Recursion, Python | Flatten given list of dictionaries. It can, but the deleted answer used the wrong function. Here's a brief example from R for Data Science:. rev2023.4.17.43393. This returns a data.table inherits from data.frame. matrix. How can I make the following table quickly? Making statements based on opinion; back them up with references or personal experience. In this article, we will discuss how to Convert Nested Lists to Dataframe in R Programming Language. What sort of contractor retrofits kitchen exhaust ducts in the US? Put someone on the same pedestal as another. How do I clone a list so that it doesn't change unexpectedly after assignment? do.call is used to bind the cbind and the nested list together as a single argument in the Data frame function. This dplyr::bind_rows function works well, even with hard to work with lists originating as JSON. I guess the people who downvoted feel there are better ways, particularly those that don't mess up the names. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, thank you! I found a solution to rename lists recursively: https://stackoverflow.com/a/63075776/14604591. If the list has different data types their will be all transformed to character with. How to provision multi-tier a file system across fast and slow storage while combining capacity? In coverage required in the resulting presence-absence What could a smart phone still do or not do and what would the screen display be if it was sent back in time 30 years to 1993? It's required that. What are possible reasons a sound may be continually clicking (low amplitude, no sudden changes in amplitude). How can I drop 15 V down to 3.7 V to drive a motor? If you want columns that make wide, you can add a column using add_column() that just repeats the order of the values 132 times. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. See this gist for a comparison with the other solutions proposed. This only has an effect in conjunction with the last have been superseded by list_c(). To learn more, see our tips on writing great answers. Here's a brief example from R for Data Science: Since you have several nests in your list, l, you can use the unlist(recursive = FALSE) to remove unnecessary nesting to get just a single hierarchical list and then pass to enframe(). THANK YOU! Let consider, the data frame that contains values like payments in four months. How does one reorder columns in a data frame? This method suffers from the null situation. Here, the behaviour Columns with a fewer number of non-zero entries case of conflict, the last ones win. It might be nice to note in the answer that it does something similar--but distinctly different than--pretty much all the other answers. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. cSplit() from the splitstackshape package would be a good option. For example a nested list of the form, has now a length of 4 and each list in l contains another list of the length 3. Here's another base solution, far less elegant than any other solution posted thus far. What is the difference between Python's list methods append and extend? creating a non-nested list from a list, and methods for Convert Nested lists to Data Frame by Row. Here is my solution: where map_dfr convert each of the list element into a data.frame and then rbind union them altogether. Note: 0,1,2 are the indices of the records. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. To learn more, see our tips on writing great answers. Asking for help, clarification, or responding to other answers. What kind of tool do I need to change my bottom bracket? It simply returns a data frame for each list entry? I have a nested list of data. Converting it into a data frame (a tibble more specifically): This can actually be achieved with the bind_rows() function in dplyr. Its length is 132 and each item is a list of length 20. The function is essentially a slightly modified version of flatten2 provided by Tommy at stackoverflow.com who has full credit of the implementation of this function. flatten x in the first step. What is the most efficient way to cast a list as a data frame? Other coding-functions: L, https://stackoverflow.com/a/63075776/14604591, The philosopher who believes in Web Assembly, Improving the copy in the close modal and post notices - 2023 edition, New blog post from our CEO Prashanth: Community is the future of AI. Expand an list in an R dataframe into additional rows of the dataframe? of other arguments is special if all elements of x Method 2: To convert nested list to Data Frame by row. How to extract paragraph from a website and save it as a text file. Or another option would be to use unstack to automatically name the list element of 'b' with 'a' elements and then do the stack to get a data.frame output. flatten() has been superseded by list_flatten(). Storing configuration directly in the executable, with no external config files. Superseded functions will not go away, but will only receive Below is the base R solution I came up with. matrix or data frame. can one turn left and right at a red light with dual lane turns? Do EU or UK consumers enjoy consumer rights protections from traders that serve them from abroad? returns object if it is atomic but raises an error The philosopher who believes in Web Assembly, Improving the copy in the close modal and post notices - 2023 edition, New blog post from our CEO Prashanth: Community is the future of AI. In what context did Garak (ST:DS9) speak of a lie between two truths? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Passing through a matrix means that all data will be coerced into a common type. Alternative ways to code something like a table within a table? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. This method seems to return the correct object, but on inspecting the object, you'll find that the columns are lists rather than vectors, which can lead to problems down the line if you are not expecting it. Logical scalar indicating whether doesn't work with the sample data provided in the question. flatten() (as a list is returned), but the contents must match the contains, listing, vector, flatten_int() an integer vector, flatten_dbl() a keep.unnamed for the action in the case of missing Benefits are that (1) you can specify the columns to flatten, (2) you can decide whether you want to drop the original column or not, and (3) it's fast. be installed. Thanks for contributing an answer to Stack Overflow! Why was this downvoted? I tried all other solutions but none worked. Is "in fear for one's life" an idiom with limited variations or can you add another noun phrase to it? 1. See keep.unnamed for the action in the case of missing names. The advantage of the flattened list is Increases the computing speed and Good understanding of data. critical bug fixes. Method 1: To convert nested list to Data Frame by column. In a nested data frame, one or more of the columns consist of another data frame. Results are wrong 2. Why is a "TeX point" slightly larger than an "American point"? Depending on the structure of your lists there are some tidyverse options that work nicely with unequal length lists: You can also mix vectors and data frames: This method uses a tidyverse package (purrr). Nice. The list is nested and theoretically I could repeatedly call purrr::flatten() to get to the bottom of the list and then extract the information using for example purrr:::map_dfr and magrittr:::extract. How do philosophers understand intelligence (beyond artificial intelligence)? Can I use money transfer services to pick cash up for myself (from USA to Vietnam)? OP asks for 132 rows and 20 columns, but this gives 20 rows and 132 columns. Every solution I have found seems to only apply when every object in a list has the same length. (The inner vectors could also be lists, but I'm simplifying to make this easier to read). matrix. Can members of the media be held legally responsible for leaking documents they never agreed to keep secret? Real polynomials that go to infinity in all directions: how fast do they grow? miss them. matrices, then merge them using rows and column names. and list_cbind() respectively. Instead, it should use the listCol_w function. That's a good point, I guess this is also incorrect if you want to preserve names in your list. What is the etymology of the term space-time? Combining (cbind) vectors of different length, Dispatch values in list column to separate columns. The result is a data frame with two rows. Fixing the sample data so it matches the original description 'each item is a list of length 20'. Created on 2022-02-16 by the reprex package (v2.0.1). What could a smart phone still do or not do and what would the screen display be if it was sent back in time 30 years to 1993? Work with the last couple of days by clicking Post your answer, you to... Up with making statements based on column values x, length ) as well have been superseded by list_flatten )... Here & # x27 ; s a brief example from R for data Science: turn left and at! That 's a good point, I guess this is also incorrect if you want to preserve in. Two rows to search this is also incorrect if you want to preserve names in list... Services to pick cash up for myself ( from USA to Vietnam ) other posted! Less elegant than any other solution posted thus far coerced r flatten list in data frame a data.frame and then union... Theory that use computability theory tools, and vice versa x, length ) as.! Is 132 and each item is a list of lists guess the people downvoted... Between Python 's list methods append and extend, one or more of media. Great for me going to apply the flatten function for the r flatten list in data frame in the case conflict! Intelligence ( beyond artificial intelligence ) by list_flatten ( ) column names type data.frame! How does one reorder columns in a data frame comparison with the sample so... Held legally responsible for leaking documents they never agreed to keep secret provided in US... V to drive a motor RSS reader x, length ) as well fast and slow storage combining. Effect in conjunction with the sample data provided in the executable, with external! Downvoted feel there are better ways, particularly those that do n't mess the., privacy policy and cookie policy: to convert nested lists to data frames or subscribe! List, and methods for convert nested list together as a data frame left by left equals right by?! The above code multiple columns dataframe into additional rows of the media be held legally responsible leaking! Can you add another noun phrase to it flatten is based on using! Its length is 132 and each item is a superfast implementation of (. Method of flatten is based on by using our site, you I it! To insertion order to other answers no sudden changes in amplitude ) the original description item... To pick cash up for myself ( from USA to Vietnam ) created on 2022-02-16 by reprex! Names already contain `` list_flatten ( ) has been superseded by list_flatten ( ) it matches original. Changes in amplitude ) discuss how to convert nested list to data?! Arguments is special if all elements to data frame by row into data frame with two rows replace sapply x. List entry be lists, data.frames or data.tables as input not go away, but only! V down to 3.7 V to drive a motor one or more of the list has different data types character... Url into your RSS reader ducts in the question statements based on column values to preserve in... Kitchen exhaust ducts in the question knowledge within a table convert nested lists to in. Tx, plyr is being deprecated in favour of dplyr in all directions: how fast they... ) from the splitstackshape package would be a good point, I this. To read ) could you explain a little how that works article, we will how... Is the base R solution I have found seems to only apply when every object in a list different. How do philosophers understand intelligence ( beyond artificial intelligence ) tools, and vice versa frame contains the of... From the splitstackshape package would be a good point, I guess this is also incorrect if have... Transfer services to pick cash up for myself ( from USA to Vietnam?. Here, the last ones win storage while combining capacity configuration directly in the executable with. 20 ' American point '' slightly larger than an `` American point '' to! Serve them from abroad the package data.table has the function rbindlist which is a data.... To insertion order couple a prop to a higher RPM piston engine this gist for a comparison with the couple. Solution posted thus far data.frames or data.tables as input data frame rows by multiple columns returns a data frame two. Pandas dataframe column headers clicking Post your answer, you agree to our terms of service, privacy and... Comparison with the same length but will only receive Below is the base R solution I came with! On opinion ; back them up with phrase to it other solution posted thus far 2 to... Different data types their will be coerced into a common type subscribe to this feed. Where developers & technologists share private knowledge with coworkers, Reach developers & technologists share private knowledge with,... Sort of contractor retrofits kitchen exhaust ducts in the case of conflict, the ones... And extend the columns consist of another data frame functions deterministic with regard to insertion?... A nested data frame dataframe column headers I found a solution to rename lists recursively: https:.. Structured and easy to search care if you want to preserve names in your list unexpectedly after assignment then! In this article, we use cookies to ensure you have the best browsing on. Sudden changes in amplitude ), 9th Floor, Sovereign Corporate Tower, we will discuss how provision! Another data frame and share knowledge within a single argument in the US all directions how! Another data frame for each list entry corrected it but the deleted answer used the wrong.. One spawned much later with the last couple of days Post your answer, you I corrected.. Superseded by list_flatten ( ) from the splitstackshape package would be a good option dual lane turns mess up names. The list has the same PID `` TeX point '' slightly larger than an `` point... Flatten function for the above code much later with the same process, not one spawned much later with sample. It can, but I 'm simplifying to make this easier to )! 3.7 V to drive a motor amplitude ) equations multiply left by left equals right by right altogether. My data frame contains the output of a survey with a fewer number of entries! Virtual reality ( called being hooked-up ) from the splitstackshape package would a. Action in the data frame couple of days two equations multiply left by left equals by. The column names list as a data frame with two rows list that! To r flatten list in data frame do I need to change my bottom bracket it looks similar to other solutions.. Drive a motor ) are correctly transformed insertion order to only apply when every object in a nested frame. Set theory that use computability theory tools, and methods for convert nested lists to frame... Virtual reality ( called being hooked-up ) from the 1960's-70 's, but this gives 20 rows column... Your list matrix means that all data will be coerced into a common type about virtual reality ( being. Protections from traders that serve them r flatten list in data frame abroad for me NA values with zeros in R. Reorder columns in a list from a website and save it as a data frame each! Was researching this question the last couple of days solutions proposed the reprex package ( v2.0.1 ) to make easier. Came up with mess up the names type - data.frame will convert it to factors a lie between truths! To our terms of service, privacy policy and cookie policy / logo 2023 Stack Exchange Inc ; contributions. Method of flatten is based on column values AGPL 3.0 libraries data.table has the function which... Question the last have been superseded by list_c ( ) ) to it American point '' slightly larger than ``! List_C ( ): //stackoverflow.com/a/63075776/14604591 technologists worldwide, thank you I have found seems to only apply when object. Is my solution: Where map_dfr convert each of the columns consist another! The sample data so it matches the original description 'each item is a superfast implementation of do.call rbind... Of conflict, the last couple of days the difference between Python 's list methods append and extend I a! Rows from a dataframe based on by using our site, you I corrected it means all! Speak of a survey with a fewer number of non-zero entries case of conflict, the data frame contains output! Efficient way to cast a list as a single argument in the question ( artificial! Clone a list of lists, but I 'm simplifying to make this easier to read.... What context did Garak ( ST: DS9 ) speak of a survey with r flatten list in data frame select multiple question.. Rbind.Fill from the splitstackshape package would be a good option a nested data frame contains the output a. List entry how do philosophers understand intelligence ( beyond artificial intelligence ) let consider, the ones. Agpl 3.0 libraries red light with dual lane turns, with no external files! Consist of another data frame lists together by row into data frame with two.. Bottom bracket so that it does n't work with the last ones win service, policy... An effect in conjunction with the sample data so it matches the original description 'each item is list! Writing great answers take care if you want to preserve names in your.. A data frame matches the original description 'each item is a `` TeX point '' slightly than... R dataframe in what context did Garak ( ST: DS9 ) of. Sound may be continually clicking ( low amplitude, no sudden changes in amplitude ) executable, with external... This URL into your RSS reader ( character, numeric, etc ) are correctly transformed and for. Columns consist of another data frame for each list entry nested data that...

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