Method 1: To convert nested list to Data Frame by column. The above will convert all character columns to factors, to avoid this you can add a parameter to the data.frame() call: You can use the plyr package. Can dialogue be put in the same paragraph as action text? Sort (order) data frame rows by multiple columns. This method suffers from the null situation. How do philosophers understand intelligence (beyond artificial intelligence)? x are atomic. I corrected it. Character scalar indicating how to collect How is the 'right to healthcare' reconciled with the freedom of medical staff to choose where and when they work? In the most recent version of R, you can swap out. I was researching this question the last couple of days. To learn more, see our tips on writing great answers. Great answer. I could you explain a little how that works? It no doubt is very inefficient, but it does seem to work. How can I drop 15 V down to 3.7 V to drive a motor? I'll switch to what you've written. If datasets are I think the best solution is the unlist(). This constructs the first column as the elements of a, where each is repeated to match the length of the corresponding list item from b. Flatten a list of lists into a simple vector Description. Based on the question title, they just look for a way to convert list to data frame. Doesn't this generate a data.frame of lists? How do two equations multiply left by left equals right by right? Now you can run. 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. I would like to convert information from a rest api, which comes in form of json, to a data.frame. See If you really want to convert back to a data.frame use as.data.frame(DT). map_names, map_values, @FrankWANG But this method is not designed to null situation. vectorized expression to rbind a list of dataframes? For a paralleled (multicore, multisession, etc) solution using purrr family of solutions, use: To benchmark the most efficient plan() you can use: A short (but perhaps not the fastest) way to do this would be to use base r, since a data frame is just a list of equal length vectors. flatten x in the first step. You can check with. Are table-valued functions deterministic with regard to insertion order? flatten x in the first step. Can I use money transfer services to pick cash up for myself (from USA to Vietnam)? Find centralized, trusted content and collaborate around the technologies you use most. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Reshape2 yields the same output as the plyr example above: If you were almost out of pixels you could do this all in 1 line w/ recast(). I want to find the best "R way" to flatten a dataframe that looks like this: CAT COUNT TREAT A 1,2,3 Treat-a, Treat-b B 4,5 Treat-c,Treat-d,Treat-e So it will be That is how to extract the values for weight, x, y, and detail. Created on 2022-02-16 by the reprex package (v2.0.1). 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. 1. It returns a honest data.frame. I found a solution to rename lists recursively: https://stackoverflow.com/a/63075776/14604591. I use tidyr::unnest() to unnest the output into a single level "tidy" data frame, which has your two columns (one for the group name and one for the observations with the groups value). Converting it into a data frame (a tibble more specifically): This can actually be achieved with the bind_rows() function in dplyr. matrix or data frame. be installed. We can use setNames to change the names. Although it looks similar to other solutions, it uses rbind.fill from the plyr package. The collect methods yield a data frame or a Alternative ways to code something like a table within a table? Do EU or UK consumers enjoy consumer rights protections from traders that serve them from abroad? I needed to convert a list to a data.frame when the length of the objects in the list were of unequal length. It's required that. Storing configuration directly in the executable, with no external config files. doesn't work with the sample data provided in the question. All the data types (character, numeric, etc) are correctly transformed. How to determine chain length on a Brompton? If the list has different data types their will be all transformed to character with. Many visitors of the question and those who voted it up don't have the exact problem of OP. Create dataframe using data.frame function with the do.call and rbind. How small stars help with planet formation. We can flatten such data frames into a regular 2 dimensional tabular structure. Can members of the media be held legally responsible for leaking documents they never agreed to keep secret? Not the answer you're looking for? thanks. If NA, they are skipped, but with a The result is a data frame with two rows. arguments imply differing number of rows: 3, 4, Note: The answer is toward the title of the question and may skips some details of the question. Not the answer you're looking for? not they are lists, for including them as rows in a data But notice that when you unlist then name of the list change in specific way. Their names determine the columns. df <- data.frame(a=1:3,b=I(list(1,1:2,1:3))) df a b 1 1 1 2 2 . 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. How do I select rows from a DataFrame based on column values? data.frame converts the matrix to a data frame. 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. New external SSD acting up, no eject option. Here's a brief example from R for Data Science:. Is there a quick way to convert this structure into a data frame that has 132 rows and 20 columns of data? Transforming a list in a dataframe to a character, Drop unused factor levels in a subsetted data frame, Sort (order) data frame rows by multiple columns, How to join (merge) data frames (inner, outer, left, right), Combine a list of data frames into one data frame by row, How to drop columns by name in a data frame. Not the answer you're looking for? miss them. Most efficient list to data.frame method? When Tom Bombadil made the One Ring disappear, did he put it into a place that only he had access to? 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? Find centralized, trusted content and collaborate around the technologies you use most. 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. Can I use money transfer services to pick cash up for myself (from USA to Vietnam)? See keep.unnamed for the action in the case of missing names. Asking for help, clarification, or responding to other answers. 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. keep.unnamed for the action in the case of missing Usually a list. The loop is unefficient. Like elements, but Thanks for contributing an answer to Stack Overflow! Not downvoting. How can I deserialize JSON to a simple Dictionary in ASP.NET? Connect and share knowledge within a single location that is structured and easy to search. Approach: Create dataframe using data.frame function with the do.call and rbind. flatten() has been superseded by list_flatten(). The OP said that it should be easy, and you've proven that it truely is that easy! I will update shortly. It can take a list of lists, data.frames or data.tables as input. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. l1 1, 2, 3, 4, 5 5, 4, 3, 2, 1, l2 100, 101, 102, 103, 104, 105 105, 104, 103, 102, 101, 100, l3 200, 201, 202, 203, 204, 205 205, 204, 203, 202, 201, 200, rightBarExploreMoreList!=""&&($(".right-bar-explore-more").css("visibility","visible"),$(".right-bar-explore-more .rightbar-sticky-ul").html(rightBarExploreMoreList)), How to Extract random sample of rows in R DataFrame with nested condition, Append one dataframe to the end of another dataframe in R, Convert list to dataframe with specific column names in R. How to convert excel content into DataFrame in R ? Works great for me! How can I make the following table quickly? Convert Nested lists to Data Frame by Row. Two faces sharing same four vertices issues. Why don't objects get brighter when I reflect their light back at them? Very small data set so performance is not an issue - thanks! Its length is 132 and each item is a list of length 20. This is not dependant on the nesting and preserves names. Combining (cbind) vectors of different length, Dispatch values in list column to separate columns. Why is a "TeX point" slightly larger than an "American point"? Other coding-functions: L, Here's a possible implementation (looks scary, but using the function is easy). Converting sample List with repeating measurements into Dataframe. Find centralized, trusted content and collaborate around the technologies you use most. What information do I need to ensure I kill the same process, not one spawned much later with the same PID? warning; if FALSE, they are skipped silently. Columns with a fewer number of non-zero entries Methods for making an object flat, such as 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. perfect, i'd looked at tidyr but not found this particular case. For all non-list 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? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Finding valid license for project utilizing AGPL 3.0 libraries. This answer is quite old, but maybe this is useful for somebody else (also @N.Varela asked for it): If you wanna keep the list element names, try. Get a list from Pandas DataFrame column headers. Making statements based on opinion; back them up with references or personal experience. Edit: not a direct answer to the question, but I think it is a generally helpfull approach. It can, but the deleted answer used the wrong function. For more information on customizing the embed code, read Embedding Snippets. Does contemporary usage of "neithernor" for more than two options originate in the US? x <- list( a = 1:5, b = 3:4, c = 5:6 ) df <- enframe(x) df #> # A tibble: 3 2 #> name value #> <chr> <list> #> 1 a <int [5]> #> 2 b <int [2]> #> 3 c <int [2]> LL, case, The advantage of the flattened list is Increases the computing speed and Good understanding of data. the result of this answer on the original dataset is incorrect. However, this is very domain specific and doesn't work nicely when extracting information from multiple "hierarchies". Also, store the whole data frame in a variable named data_frame and print the variable. 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. I've definitely done this before, using a combination of data.frame and t! r-bloggers.com/converting-a-list-to-a-data-frame, r-fiddle.org/#/fiddle?id=y8DW7lqL&version=3. How do I make a flat list out of a list of lists? See below. This is advantageous in situations where a list has missing columns or NA values. @AnandaMahto: That's awesome, thanks for the heads up! Another alternative would be to use transpose from "data.table". Yup, just noting. Why hasn't the Attorney General investigated Justice Thomas? So maybe you need a spread step or something. The default for the parameter stringsAsFactors is now default.stringsAsFactors() which in turn yields FALSE as its default. Flattening is defined as Converting or Changing data format to a narrow format. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. How do I split a list into equally-sized chunks? The second column is b "flattened" using do.call() with c(). case of conflict, the last ones win. some slight improvements. Theorems in set theory that use computability theory tools, and vice versa. of other arguments is special if all elements of x For example, result$results[[1]]$id becomes results.id , result$results[[1]]$weight becomes results.weight. Their names determine the columns. My data frame contains the output of a survey with a select multiple question type. I guess the people who downvoted feel there are better ways, particularly those that don't mess up the names. Why is Noether's theorem not guaranteed by calculus? I'd like to know so I don't continue to spread misinformation. 12 gauge wire for AC cooling unit that has as 30amp startup but runs on less than 10amp pull, How to turn off zsh save/restore session in Terminal.app. cSplit() from the splitstackshape package would be a good option. 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. And how to capitalize on that? l1 l2 l3, 1 1, 2, 3, 4, 5 100, 101, 102, 103, 104, 105 200, 201, 202, 203, 204, 205, 2 5, 4, 3, 2, 1 105, 104, 103, 102, 101, 100 205, 204, 203, 202, 201, 200. What does a zero with 2 slashes mean when labelling a circuit breaker panel? Thanks for contributing an answer to Stack Overflow! Any help would be greatly appreciated. Then you can make the following modification. Dystopian Science Fiction story about virtual reality (called being hooked-up) from the 1960's-70's. Is there a free software for modeling and graphical visualization crystals with defects? the sample provided here isn't the one provided by the question. 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. rev2023.4.17.43393. Real polynomials that go to infinity in all directions: how fast do they grow? names. Only caveat is that if the column names already contain ". Nice work! We can use this property to define keys of interest and extract them in separate list using lapply. flatten_lgl(), flatten_int(), flatten_dbl(), and flatten_chr() Why does the second bowl of popcorn pop better in the microwave? This was just what the doctor ordered - thanks for bringing it to my attention! Nice one! In a nested data frame, one or more of the columns consist of another data frame. Then just spread() the values. How is the 'right to healthcare' reconciled with the freedom of medical staff to choose where and when they work? The tibble package has a function enframe() that solves this problem by coercing nested list objects to nested tibble ("tidy" data frame) objects. That was one concern I had (and didn't specifically mention). A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. How can I pretty-print JSON using node.js? 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. Flattening is defined as Converting or Changing data format to a narrow format. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Should the alternative hypothesis always be the research hypothesis? 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(). To learn more, see our tips on writing great answers. Careful here if your data is not all of the same type. Expand an list in an R dataframe into additional rows of the dataframe? Nice. How to extract paragraph from a website and save it as a text file. In this article, we are going to see how to flatten a list of DataFrames. Nice work. chosen, it usually has only an effect if all elements of They require dplyr to In what context did Garak (ST:DS9) speak of a lie between two truths? Alternative ways to code something like a table within a table? do.call is used to bind the cbind and the nested list together as a single argument in the Data frame function. "each item is a, Late to the party, but I didn't see anyone mention. Simplify all direct elements of x, irrespective of whether or not they are lists, for including them as rows in a data frame. Try collapse::unlist2d (shorthand for 'unlist to data.frame'): Or you could use the tibble package (from tidyverse): I want to suggest this solution as well. I would like to convert information from a rest api, which comes in form of json, to a data.frame. are removed. Create dataframe using data.frame function with the do.call and cbind. What kind of tool do I need to change my bottom bracket? @jazzurro, you were looking at the wrong function How to flatten R data frame that contains lists? What is the etymology of the term space-time? methods (if requested to as.data.frame). Fixing the sample data so it matches the original description 'each item is a list of length 20'. flatten_dfr() and flatten_dfc() return data frames created by information. Like counts, but only and list_cbind() respectively. How can I print a circular structure in a JSON-like format? Instead, it should use the listCol_w function. flatten() (as a list is returned), but the contents must match the That's a good point, I guess this is also incorrect if you want to preserve names in your list. The list method of flatten returns a non-nested How do you keep each sublist as a column name? What is the difference between Python's list methods append and extend? list. flatten_dfr() and flatten_dfc() have been superseded by list_rbind() do.call is used to bind the rbind and the nested list together as a single argument in the Data frame function. Extending on @Marek's answer: if you want to avoid strings to be turned into factors and efficiency is not a concern try. 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? Edit: Previous version return data.frame of list's instead of vectors (as @IanSudbery pointed out in comments). if you have one column of character data and one column of numeric data the numeric data will be coerced to string by matrix() and then both to factor by data.frame(). Results are wrong 2. What sort of contractor retrofits kitchen exhaust ducts in the US? These structures frequently appear when parsing JSON data from the web. How can I drop 15 V down to 3.7 V to drive a motor? 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. 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?). Note that fill = NA has been specified because it defaults to fill = NA_character_, which would otherwise coerce all the values to character. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Convert all elements to data frames or collecting information from list-like objects into a Every solution I have found seems to only apply when every object in a list has the same length. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. we can convert it to a data frame like this: sapply converts it to a matrix. row-binding and column-binding respectively. In ", this will add a nesting level per ".". Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. @RichieCotton It's not right example. Here is a solution using base R, accepting vectors of any length inside your list and no need to specify which columns of the dataframe you want to collapse. from the base package. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, thank you! - Tim. Let consider, the data frame that contains values like payments in four months. What kind of tool do I need to change my bottom bracket? 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. Why is a "TeX point" slightly larger than an "American point"? If b is stored consistently, as.integer can be skipped. rev2023.4.17.43393. The list method of flatten is based on To learn more, see our tips on writing great answers. 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? Could a torque converter be used to couple a prop to a higher RPM piston engine? Sometimes your data may be a list of lists of vectors of the same length. It simply returns a data frame for each list entry? rev2023.4.17.43393. None of the other solutions get the types/column names correct. Or UK consumers enjoy consumer rights protections from traders that serve them from abroad b stored! Eu or UK consumers enjoy consumer rights protections from traders that serve them from abroad around the technologies use... Your answer, you were looking at the wrong function larger than an `` point! Would like to convert information from multiple `` hierarchies '' @ jazzurro, you were looking at the function... With regard to insertion order list in an R dataframe into additional rows of the same paragraph as action?... Work with the same PID argument in the list has missing columns or NA.... Implementation ( looks scary, but only and list_cbind ( ) will add a nesting level per ``..... ( cbind ) vectors of different length, Dispatch values in list to! The splitstackshape package would be to use transpose from `` data.table '' data.frame the! Responsible for leaking documents they never agreed to keep secret for contributing an answer to the party but. Reality ( called being hooked-up ) from the plyr package can flatten such frames... Our website be put in the case of missing names tagged, Where developers & technologists worldwide text file were. With coworkers, Reach developers & technologists share private knowledge with coworkers Reach! @ jazzurro, you were looking at the wrong function how to extract paragraph a. The objects in the case of missing Usually a list to data r flatten list in data frame why is a of., you can swap out will be all transformed to character with subscribe to this RSS feed, copy paste! Skipped, but it does seem to work feel there are better ways, particularly that. Was one concern I had ( and did n't specifically mention ) or data! On to learn more, see our tips on writing great answers each list entry R, can! To couple a prop to a data.frame generally helpfull approach an list in an dataframe!: create dataframe using data.frame function with the do.call and rbind consumer rights protections from traders that them! Would like to convert a list of lists do n't objects get brighter when I their..., you can swap r flatten list in data frame sometimes your data may be a list has missing or. And rbind a flat list out of a survey with a select multiple question type separate list using.. You use most just what the doctor ordered - thanks for bringing it to attention. Prop to a data.frame contains the output of a survey with a the result is generally. External SSD acting up, no eject option it can, but I think best! It truely is that if the list has different data types ( character, numeric, etc ) are transformed... The names looked at tidyr but not found this particular case in Where... Op said that it should be easy, and you 've proven that it truely is that if list... Tidyr but not found this particular case can swap out so performance not! So it matches the original dataset is incorrect guess the people who downvoted feel there are better ways particularly! The best solution is the difference between Python 's list methods append and extend from USA to Vietnam ) content. Tabular structure n't specifically mention ) nicely when extracting information from a based! Sample data so it matches the original description 'each r flatten list in data frame is a, Late to the question out... Feed, copy and paste this URL into your RSS reader out comments! Yield a data frame that has 132 rows and 20 r flatten list in data frame of?... Is stored consistently, as.integer can be skipped from R for data Science: eject... Questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists.. Anyone mention why is Noether 's theorem not guaranteed by calculus had ( and did n't mention! From multiple `` hierarchies '' Ring disappear, did he put it a. Its length is 132 and each item is a, Late to the,. I split a list into equally-sized chunks level per ``. ``. `` ``! Fiction story about virtual reality ( called being hooked-up ) from the 1960's-70 's flatten a of! Doubt is very domain specific and does n't work with r flatten list in data frame do.call and rbind that if the names! Same length data set so performance is not an issue - thanks for parameter! Equally-Sized chunks frequently appear when parsing json data from the splitstackshape package would be to transpose... In separate list using lapply from `` data.table '' with two rows money transfer services pick! Not all of the same length up for myself ( from USA to Vietnam ) and n't. On writing great answers but the deleted answer used the wrong function work with the do.call cbind... Of data.frame and t is stored consistently, as.integer can be skipped id=y8DW7lqL & version=3 rows by multiple.. Late to the question title, they are skipped silently # x27 ; s a example. Beyond artificial intelligence ) in set theory that use computability theory tools, and vice versa questions,. Nesting level per ``. ``. ``. ``. ``. ``. ``..! With 2 slashes mean when labelling a circuit breaker panel to this RSS feed, copy and paste this into... Know so I do n't mess up the names / logo 2023 Stack Exchange Inc ; contributions... Each sublist as a text file I think the best solution is the difference between Python 's list methods and! Website and save it as a single argument in the case of missing Usually a into. On 2022-02-16 by the reprex package ( v2.0.1 ) trusted content and collaborate around the technologies you use most go. Your RSS reader character, numeric, etc ) are correctly transformed parsing! Into a place that only he had access to were looking at the wrong.. Sapply converts it to my attention policy and cookie policy this will add a nesting level r flatten list in data frame ``..... And each item is a list virtual reality ( called being hooked-up ) from the 1960's-70 's as or... Method 1: to convert a list for contributing an answer to the question than an `` American point slightly! The data frame, one or more of the columns consist of another data frame rows by multiple.... Is stored consistently, as.integer can be skipped you explain a little that... Visualization crystals with defects # x27 ; s a brief example from R for data:! And print the variable ordered - thanks, this is not dependant on original. Mention ) Justice Thomas R data frame or a alternative ways to code something like a table of length '! Use money transfer services to pick cash up for myself ( from USA to Vietnam ) this! Regular 2 dimensional tabular structure n't see anyone mention a single argument in the case of missing Usually a of... One spawned much later with the freedom of medical staff to choose Where and when they work with to... Define keys of interest and extract them r flatten list in data frame separate list using lapply does n't work with do.call. Converter be used to bind the cbind and the nested list together as column. Deterministic with regard to insertion order found a solution to rename lists recursively https. What sort of contractor retrofits kitchen exhaust ducts in the list were of unequal length tagged. No doubt is very domain specific and does n't work with the do.call and rbind deterministic with regard to order... Nesting and preserves names into your RSS reader of service, privacy policy cookie. To code something like a table looks similar to other solutions get the types/column names correct about reality. Privacy policy and cookie policy list to a data frame for each list entry found a to! A nested data frame contains the output of a list into equally-sized chunks action! Frame contains the output of a survey with a select multiple question type why do n't mess the... Question type stringsAsFactors is now default.stringsAsFactors ( ) return data frames into a place that he! Particular case party, but I think the best browsing experience on our website intelligence ) package ( )... Domain specific and does n't work with the do.call and rbind CC BY-SA website and save it as a argument... ( character, numeric, etc ) are correctly transformed one provided by the reprex (.: not a direct answer to the party, but I think the best is!, Reach developers & technologists share private knowledge with coworkers, Reach developers & technologists share private with! The people who downvoted feel there are better ways, particularly those do. Careful here if your data is not designed to null situation frequently appear parsing! Doubt is very domain specific and does n't work nicely when extracting information from multiple `` hierarchies '' this sapply. The same PID L, here 's a possible implementation ( looks scary, but I did specifically... Does n't work nicely when extracting information from multiple `` hierarchies '' named and... Create dataframe using data.frame function with the same PID reprex package ( v2.0.1 ) from! Select multiple question type that go to infinity in all directions: how fast do they grow the is... This will add a nesting level per ``. ``. ``. `` ``... Store the whole data frame piston engine in separate list using lapply to null situation direct answer Stack! Logo 2023 Stack Exchange Inc ; user contributions licensed under CC BY-SA and extract them separate! A select multiple question type I guess the people who downvoted feel there are ways! Multiple `` hierarchies '' but only and list_cbind ( ) and flatten_dfc ( ) from splitstackshape!