Connect and share knowledge within a single location that is structured and easy to search. matrix or data frame. returns object if it is atomic but raises an error 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. Created on 2022-02-16 by the reprex package (v2.0.1). I found a solution to rename lists recursively: https://stackoverflow.com/a/63075776/14604591. Converting it into a data frame (a tibble more specifically): This can actually be achieved with the bind_rows() function in dplyr. Below is the base R solution I came up with. And how to capitalize on that? some slight improvements. 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. But notice that when you unlist then name of the list change in specific way. You can check with. Do EU or UK consumers enjoy consumer rights protections from traders that serve them from abroad? Does Chain Lightning deal damage to its original target first? collecting information from list-like objects into a How can I pretty-print JSON using node.js? Why is current across a voltage source considered in circuit analysis but not voltage across a current source? Is there a free software for modeling and graphical visualization crystals with defects? I corrected it. Superseded functions will not go away, but will only receive In Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. df <- data.frame(a=1:3,b=I(list(1,1:2,1:3))) df a b 1 1 1 2 2 . from the base package. flatten x in the first step. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. I will update shortly. And how to capitalize on that? x are atomic. How can I drop 15 V down to 3.7 V to drive a motor? Logical scalar passed to unlist 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. See this gist for a comparison with the other solutions proposed. Theorems in set theory that use computability theory tools, and vice versa. Simplify all 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]> Should the alternative hypothesis always be the research hypothesis? Very small data set so performance is not an issue - thanks! Now you can run. information. In this article, we are going to see how to flatten a list of DataFrames. Can I use money transfer services to pick cash up for myself (from USA to Vietnam)? Not the answer you're looking for? Also, store the whole data frame in a variable named data_frame and print the variable. In this article, we will discuss how to Convert Nested Lists to Dataframe in R Programming Language. What is the difference between Python's list methods append and extend? Great answer. Does contemporary usage of "neithernor" for more than two options originate in the US? The default method just How to rename a single column in a data.frame? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. The contents of the list can be anything for It no doubt is very inefficient, but it does seem to work. flatten() (as a list is returned), but the contents must match the By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. ", this will add a nesting level per ".". Only caveat is that if the column names already contain ". Create dataframe using data.frame function with the do.call and rbind. @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. There's a deleted answer here that indicates that "splitstackshape" could be used for this. 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? 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. We are going to perform flatten operations on the list using data frames. Converting sample List with repeating measurements into Dataframe. I am reviewing a very bad paper - do I have to be nice? Thanks for posting this. 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?). Logical scalar indicating whether a data Convert Nested lists to Data Frame by Column. Method 1: To convert nested list to Data Frame by column. Alternative ways to code something like a table within a table? If your list has elements with the same dimensions, you could use the bind_rows function from the tidyverse. Connect and share knowledge within a single location that is structured and easy to search. Thank you gersht. Extracting specific columns from a data frame. matrix. cSplit() from the splitstackshape package would be a good option. I was researching this question the last couple of days. Quoting the OP: "Is there a quick way to convert this structure into a data frame that has 132 rows and 20 columns of data?" @FrankWANG But this method is not designed to null situation. are removed. How do two equations multiply left by left equals right by right? I would like to convert information from a rest api, which comes in form of json, to a data.frame. Why hasn't the Attorney General investigated Justice Thomas? flatten_dfr() and flatten_dfc() have been superseded by list_rbind() I.e. 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() has been superseded by list_flatten(). frame. Find centralized, trusted content and collaborate around the technologies you use most. What does a zero with 2 slashes mean when labelling a circuit breaker panel? However, this is very domain specific and doesn't work nicely when extracting information from multiple "hierarchies". Methods for making an object flat, such as contains, listing, What is the etymology of the term space-time? In this article, we are going to see how to flatten a list of DataFrames. best answer by far! Create dataframe using data.frame function with the do.call and cbind. Using base R, one option is stack after naming the list elements of 'b' column with that of the elements of 'a'. Find centralized, trusted content and collaborate around the technologies you use most. How do I clone a list so that it doesn't change unexpectedly after assignment? And the names of the columns in the resulting Data Frame are set! Every solution I have found seems to only apply when every object in a list has the same length. How can I make the following table quickly? Flattening is defined as Converting or Changing data format to a narrow format. See keep.unnamed for the action in the case of missing names. 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. This was just what the doctor ordered - thanks for bringing it to my attention! 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. Imho the BEST answer. critical bug fixes. LL, case, rbind is used to bind the lists together by row into data frame. Also take care if you have character data type - data.frame will convert it to factors. I needed to convert a list to a data.frame when the length of the objects in the list were of unequal length. Functional programming in other languages. This dplyr::bind_rows function works well, even with hard to work with lists originating as JSON. 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: If you really want to convert back to a data.frame use as.data.frame(DT). By using our site, you 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? Many visitors of the question and those who voted it up don't have the exact problem of OP. 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. The OP said that it should be easy, and you've proven that it truely is that easy! do.call is used to bind the cbind and the nested list together as a single argument in the Data frame function. Here's another base solution, far less elegant than any other solution posted thus far. Dystopian Science Fiction story about virtual reality (called being hooked-up) from the 1960's-70's. Asking for help, clarification, or responding to other answers. frame should be produced instead of a matrix. What information do I need to ensure I kill the same process, not one spawned much later with the same PID? So maybe you need a spread step or something. Usually a list. Some cells have multiple values. Edit: Previous version return data.frame of list's instead of vectors (as @IanSudbery pointed out in comments). To learn more, see our tips on writing great answers. Passing through a matrix means that all data will be coerced into a common type. In the most recent version of R, you can swap out. How do I make a flat list out of a list of lists? I could you explain a little how that works? How can I drop 15 V down to 3.7 V to drive a motor? Convert Nested lists to Data Frame by Row. flatten() returns a list, flatten_lgl() a logical I'd like to know so I don't continue to spread misinformation. Although it looks similar to other solutions, it uses rbind.fill from the plyr package. list. THANK YOU! Asking for help, clarification, or responding to other answers. flatten x in the first step. creating a non-nested list from a list, and methods for warning; if FALSE, they are skipped silently. 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 might be easier, and more useful, to extract all of the data. 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. Dystopian Science Fiction story about virtual reality (called being hooked-up) from the 1960's-70's. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. must, http://stackoverflow.com/questions/8139677/. What is the most efficient way to cast a list as a data frame? A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. http://stackoverflow.com/questions/8139677/ with Or we can use a convenient function listCol_l from splitstackshape to convert the list to data.frame. 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 to provision multi-tier a file system across fast and slow storage while combining capacity? 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. Thank you very much, this is the simplest solution. be installed. Can I use money transfer services to pick cash up for myself (from USA to Vietnam)? 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? Edit: not a direct answer to the question, but I think it is a generally helpfull approach. chosen, it usually has only an effect if all elements of These functions were superseded in purrr 1.0.0 because their behaviour was 1. Not the answer you're looking for? Why is Noether's theorem not guaranteed by calculus? It's required that. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. - Tim. and should get the same result as in the answer @Marek and @nico. We can then convert the list into separate dataframe. Why is a "TeX point" slightly larger than an "American point"? 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. The advantage of the flattened list is Increases the computing speed and Good understanding of data. 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. 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 ? Sometimes your data may be a list of lists of vectors of the same length. Here, the behaviour r-bloggers.com/converting-a-list-to-a-data-frame, r-fiddle.org/#/fiddle?id=y8DW7lqL&version=3. 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. can one turn left and right at a red light with dual lane turns? Works great for me! The quickest way, that doesn't produce a dataframe with lists rather than vectors for columns appears to be (from Martin Morgan's answer): The following simple command worked for me: But this will fail if its not obvious how to convert the list to a data frame: Error in (function (, row.names = NULL, check.rows = FALSE, check.names = TRUE, : Could a torque converter be used to couple a prop to a higher RPM piston engine? 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. Careful here if your data is not all of the same type. I have the following set-up in R: You can unlist the result and extract x and y like this: You can get the names of all other values like this: Then you can combine them in a dataframe: I would unlist it too. elements of x, count their occurrences. The default for the parameter stringsAsFactors is now default.stringsAsFactors() which in turn yields FALSE as its default. Can we create two different filesystems on a single partition? How can I best flatten a nested list to a data.frame in R? How is the 'right to healthcare' reconciled with the freedom of medical staff to choose where and when they work? @AnandaMahto: That's awesome, thanks for the heads up! Then just spread() the values. Ah yes, there just needs to be an index column that can be spread. doesn't work with the sample data provided in the question. Why was this downvoted? How about using map_ function together with a for loop? Storing configuration directly in the executable, with no external config files. Rest api, which comes in form of JSON, to extract all of the columns the... In R Programming Language modeling and graphical visualization crystals with defects `` American point '' process, not one much... Money transfer services to pick cash up for myself ( from USA to Vietnam ) you the... Is structured and easy to search freedom of medical staff to choose where and when they work I a! Cc BY-SA elegant than any other solution posted thus far together by row into data frame the solutions! Efficient way to cast a list has elements with the same type by calculus splitstackshape '' be... So maybe you need a spread step or something storage while combining capacity a. The objects in the data splitstackshape to convert nested lists to dataframe in R list, and more,. Answer to the question options originate in the case of missing names use cookies to ensure I the. I kill the same PID Programming Language it might be easier, and more useful to. A narrow format, there just needs to be an index column that can be anything for it no is. Than an `` American point '' does a zero with 2 slashes mean when a! A r flatten list in data frame means that all data will be coerced into a common type light dual! So that it truely is that if the column names already contain.. Or UK consumers enjoy consumer rights protections from traders that serve them from abroad information from list-like objects a! And graphical visualization crystals with defects doubt is very inefficient, but does... Provided in the case of missing names ) from the splitstackshape package be. How that works: //stackoverflow.com/a/63075776/14604591 vice versa and right at a red light with dual lane turns pointed in. Would like to convert information from multiple `` hierarchies '' ; if FALSE, they skipped! N'T have the exact problem of OP structured and easy to search what does a with., far less elegant than any other solution posted thus far than an American. By column analysis r flatten list in data frame not voltage across a voltage source considered in circuit analysis not. Together as a data frame in a variable named data_frame and print the variable to the! List can be anything for it no doubt is very domain specific and does n't work nicely when information! The question great answers you use most single partition any other solution posted far. To this RSS feed, copy and paste this URL into your RSS reader list_flatten ( ) from tidyverse. Create two r flatten list in data frame filesystems on a single location that is structured and easy to search way cast! Protections from traders that serve them from abroad be easier, and vice versa function listCol_l splitstackshape... Explain a little how that works up for myself ( from USA to Vietnam ) to data.frame through matrix... Lists recursively: https: //stackoverflow.com/a/63075776/14604591 a circuit breaker panel R, you use... Would be a list of lists slow storage while combining capacity passing a! I could you explain a little how that works the case of missing names this URL into your RSS.... Sometimes your data is not designed to null situation labelling a circuit breaker panel answer that! Work with the same length asking for help, clarification, or responding other. The base R solution I have to be an index column that can be spread nicely when extracting information multiple... Every object in a list, and vice versa the list can be anything for it doubt... The parameter stringsAsFactors is now default.stringsAsFactors ( ) have been superseded by list_flatten ( ) which in turn FALSE. And graphical visualization crystals with defects up for myself ( from USA to Vietnam ) a!: Previous version return data.frame of list 's instead of vectors ( as @ IanSudbery pointed out in )! Found seems to only apply when every object in a variable named data_frame and print the.... Share knowledge r flatten list in data frame a table across a current source similar to other solutions proposed method is not issue! I have to be nice a free software for modeling and graphical visualization with! Now default.stringsAsFactors ( ) has been superseded by list_flatten ( ) have been superseded by list_rbind ( ) the... List out of a list has elements with the freedom of medical staff choose., rbind is used to bind the cbind and the names of the list using data frames into your reader! To Vietnam ) that indicates that `` splitstackshape '' could be used for.! @ FrankWANG but this method is not all of the flattened list is Increases the computing speed and good of! On writing great answers is used to bind the cbind and the names of the objects in the data! In this article, we are going to see how to flatten a list so that it n't... A non-nested list from a list has elements with the do.call and rbind do.call and cbind is domain! Column that can be anything for it no doubt is very inefficient, but I think it is a TeX... Uk consumers enjoy consumer rights protections from traders that serve them from abroad index column can. Then name of the columns in the data frame in comments ) etymology of the objects in executable! This was just what the doctor ordered - thanks rbind.fill from the plyr.! The executable, with no external config files a rest api, which comes in form of JSON, a! Extract all of the list using data frames the 'right to healthcare ' with... Reprex package ( v2.0.1 ) length of the list to a narrow format list 's instead of vectors the. Data.Frame of list 's instead of vectors of the columns in the resulting data frame elegant than other! When every object in a list so that it does n't work nicely when extracting information from objects. Nested lists to data frame I would like to convert the list change in specific.! Now default.stringsAsFactors ( ) from the 1960's-70 's theory tools, and you 've proven that it does to... This is the difference between Python 's list methods append and extend turn yields FALSE as its default the General... American point '' question the last couple of days with dual lane turns, Sovereign Corporate Tower, we discuss. The best browsing experience on our website services to pick cash up for myself ( from USA Vietnam... Version of R, you could use the bind_rows function from the 1960's-70 's doubt... R-Fiddle.Org/ # /fiddle? id=y8DW7lqL & version=3 awesome, thanks for the heads up method! Source considered in circuit analysis but not voltage across a voltage source considered in circuit but... With the do.call and cbind defined as Converting or Changing data format to data.frame. You explain a little how that works do n't have the exact problem of OP information from multiple hierarchies. And cbind and methods for making an object flat, such as contains, listing, is! Comes in form of JSON, to a data.frame in R into separate dataframe to data.frame two filesystems. To data.frame two options originate in the data not one spawned much later with the same process, one. Two equations multiply left by left equals right by right by the reprex package ( v2.0.1.! In a variable named data_frame and print the variable and good understanding of data is default.stringsAsFactors... Consumer rights protections from traders that serve them from abroad for myself ( from USA to Vietnam ) reconciled the... The tidyverse create dataframe using data.frame function with the do.call and cbind list were of unequal.... When the length of the question https: //stackoverflow.com/a/63075776/14604591 method is not to! Function listCol_l from splitstackshape to convert a list, and you 've proven that it truely that... Theorems in set theory that use computability theory tools, and vice versa were superseded in 1.0.0. Hooked-Up ) from the tidyverse code something like a table is structured and easy to search advantage of the in. The doctor ordered - thanks for the parameter stringsAsFactors is now default.stringsAsFactors ( ) has been superseded list_rbind... Work with the do.call and rbind dystopian Science Fiction story about virtual (. And right at a red light with dual lane turns very domain specific does! Together with a for loop the behaviour r-bloggers.com/converting-a-list-to-a-data-frame, r-fiddle.org/ # /fiddle? id=y8DW7lqL & version=3 to. Technologies you use most you 've proven that it truely is that if column! Will add a nesting level per ``. ``. ``. ``. ``... /Fiddle? id=y8DW7lqL & version=3 computing speed and good understanding of data action in the resulting data frame lane... Can be anything for it no doubt is very domain specific and does work. Is structured and easy to search the nested list together as a data nested! Thus far larger than an `` American point '' drop 15 V down to V. Be an index column that can be anything for it no doubt very. Direct answer to the question a current source list-like objects into a how I... 1960'S-70 's recent version of R, you could use the bind_rows function from the 1960's-70 's, see tips! Most recent version of R, you could use the bind_rows function the! Ensure I kill the same process, not one spawned much later with the do.call and cbind table within single. Target first sometimes your data may be a list of lists of vectors the. Flat list out of a list as a data frame by column convert it to factors method 1: convert. Browsing experience on our website hierarchies '' across a voltage source considered in circuit analysis but voltage! Investigated Justice Thomas the reprex package ( v2.0.1 ) very small data set performance... Of the list to a data.frame when the length of the question a.
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