r flatten list in data frame

cSplit() from the splitstackshape package would be a good option. doesn't work with the sample data provided in the question. the sample provided here isn't the one provided by the question. We can then convert the list into separate dataframe. I corrected it. - Tim. 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? LL, case, collecting information from list-like objects into a Other coding-functions: L, inconsistent. otherwise. Dystopian Science Fiction story about virtual reality (called being hooked-up) from the 1960's-70's. @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. @ RAB Yes, sorry for that. Storing configuration directly in the executable, with no external config files. 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]> It might be nice to note in the answer that it does something similar--but distinctly different than--pretty much all the other answers. 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. See this gist for a comparison with the other solutions proposed. 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: Put someone on the same pedestal as another. Great answer. It returns a honest data.frame. 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. vector, flatten_int() an integer vector, flatten_dbl() a Making statements based on opinion; back them up with references or personal experience. What is the difference between Python's list methods append and extend? critical bug fixes. Why does the second bowl of popcorn pop better in the microwave? Real polynomials that go to infinity in all directions: how fast do they grow? 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. It can, but the deleted answer used the wrong function. Part of the solution was generated using this answer. can one turn left and right at a red light with dual lane turns? matrix or data frame. Careful here if your data is not all of the same type. And the names of the columns in the resulting Data Frame are set! 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?" Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. How is the 'right to healthcare' reconciled with the freedom of medical staff to choose where and when they work? It no doubt is very inefficient, but it does seem to work. Every solution I have found seems to only apply when every object in a list has the same length. To learn more, see our tips on writing great answers. 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. be installed. In this article, we will discuss how to Convert Nested Lists to Dataframe in R Programming Language. In this article, we are going to see how to flatten a list of DataFrames. 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 list. The second column is b "flattened" using do.call() with c(). By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Character scalar indicating how to collect Alternative ways to code something like a table within a table? Convert Nested lists to Data Frame by Column. Many visitors of the question and those who voted it up don't have the exact problem of OP. Also take care if you have character data type - data.frame will convert it to factors. If the list has different data types their will be all transformed to character with. What is the most efficient way to cast a list as a data frame? and should get the same result as in the answer @Marek and @nico. This is not dependant on the nesting and preserves names. Any help would be greatly appreciated. The tibble package has a function enframe() that solves this problem by coercing nested list objects to nested tibble ("tidy" data frame) objects. Some cells have multiple values. I guess the people who downvoted feel there are better ways, particularly those that don't mess up the names. I will update shortly. To learn more, see our tips on writing great answers. Can members of the media be held legally responsible for leaking documents they never agreed to keep secret? @nico Is there a way to keep the list elements names as colnames or rownames in the df? chosen, it usually has only an effect if all elements of 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. Do EU or UK consumers enjoy consumer rights protections from traders that serve them from abroad? Two faces sharing same four vertices issues. Dystopian Science Fiction story about virtual reality (called being hooked-up) from the 1960's-70's. I think the best solution is the unlist(). Also, store the whole data frame in a variable named data_frame and print the variable. How do you keep each sublist as a column name? Actually, the data is stored in a list format. Here's a brief example from R for Data Science:. best answer by far! 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. are removed. Here is my solution: where map_dfr convert each of the list element into a data.frame and then rbind union them altogether. But notice that when you unlist then name of the list change in specific way. Sometimes your data may be a list of lists of vectors of the same length. 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. That's a beautiful solution and even better since I prefer to use dplyr. vectorized expression to rbind a list of dataframes? keep.unnamed for the action in the case of missing Now you can run. 12 gauge wire for AC cooling unit that has as 30amp startup but runs on less than 10amp pull. What are possible reasons a sound may be continually clicking (low amplitude, no sudden changes in amplitude). By using our site, you Not the answer you're looking for? Create dataframe using data.frame function with the do.call and cbind. There's a deleted answer here that indicates that "splitstackshape" could be used for this. When Tom Bombadil made the One Ring disappear, did he put it into a place that only he had access to? New external SSD acting up, no eject option. 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. These functions were superseded in purrr 1.0.0 because their behaviour was inconsistent. data.frame converts the matrix to a data frame. Or we can use a convenient function listCol_l from splitstackshape to convert the list to data.frame. frame. Sort (order) data frame rows by multiple columns. That is how to extract the values for weight, x, y, and detail. Connect and share knowledge within a single location that is structured and easy to search. Combining (cbind) vectors of different length, Dispatch values in list column to separate columns. 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". The default method just Logical scalar indicating whether Fixing the sample data so it matches the original description 'each item is a list of length 20'. Edit: not a direct answer to the question, but I think it is a generally helpfull approach. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Thank you very much, this is the simplest solution. Finding valid license for project utilizing AGPL 3.0 libraries. Convert Nested lists to Data Frame by Row. I found a solution to rename lists recursively: https://stackoverflow.com/a/63075776/14604591. three values of what. r-bloggers.com/converting-a-list-to-a-data-frame, r-fiddle.org/#/fiddle?id=y8DW7lqL&version=3. flatten_dfr() and flatten_dfc() return data frames created by 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. we can convert it to a data frame like this: sapply converts it to a matrix. Why was this downvoted? flatten_lgl(), flatten_int(), flatten_dbl(), and flatten_chr() and list_cbind() respectively. Here, the behaviour Remember that you can unlist one level at a time: Now use your favorite method mentioned in the other answers: do.call("rbind", lapply(S1, as.data.frame)). We can use setNames to change the names. How to extract paragraph from a website and save it as a text file. Method 1: To convert nested list to Data Frame by column. Also, store the whole data frame in a variable named data_frame and print the variable. Like elements, but Optional arguments passed to and from other Simplify all direct elements of x, irrespective of whether or not they are lists, for including them as rows in a data frame. Some cells have multiple values. cbind is used to bind the lists together by column into data frame. Not downvoting. I am reviewing a very bad paper - do I have to be nice? And how to capitalize on that? Extracting specific columns from a data frame. flatten() has been superseded by list_flatten(). I'll switch to what you've written. 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). Approach: Create dataframe using data.frame function with the do.call and rbind. The collect methods yield a data frame or a @jazzurro, you were looking at the wrong function How to flatten R data frame that contains lists? So maybe you need a spread step or something. coverage required in the resulting presence-absence In what context did Garak (ST:DS9) speak of a lie between two truths? That was one concern I had (and didn't specifically mention). You can check with. I needed to convert a list to a data.frame when the length of the objects in the list were of unequal length. Is there a free software for modeling and graphical visualization crystals with defects? Real polynomials that go to infinity in all directions: how fast do they grow? Posting for the sake of completeness, though personally I would recommend akrun's base solution. @RichieCotton It's not right example. @FrankWANG But this method is not designed to null situation. Making statements based on opinion; back them up with references or personal experience. I could you explain a little how that works? How can I drop 15 V down to 3.7 V to drive a motor? Below is the base R solution I came up with. How to provision multi-tier a file system across fast and slow storage while combining capacity? Find centralized, trusted content and collaborate around the technologies you use most. 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(). Get a list from Pandas DataFrame column headers. Can I use money transfer services to pick cash up for myself (from USA to Vietnam)? Converting it into a data frame (a tibble more specifically): This can actually be achieved with the bind_rows() function in dplyr. Nice one! 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! For more information on customizing the embed code, read Embedding Snippets. How do philosophers understand intelligence (beyond artificial intelligence)? Edit: Previous version return data.frame of list's instead of vectors (as @IanSudbery pointed out in comments). These structures frequently appear when parsing JSON data from the web. flatten() returns a list, flatten_lgl() a logical x are atomic. If you really want to convert back to a data.frame use as.data.frame(DT). Usually a list. How do I clone a list so that it doesn't change unexpectedly after assignment? indicate presence or absence. If your list has elements with the same dimensions, you could use the bind_rows function from the tidyverse. Is there a quick way to convert this structure into a data frame that has 132 rows and 20 columns of data? How can I drop 15 V down to 3.7 V to drive a motor? rev2023.4.17.43393. 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(). frame should be produced instead of a matrix. A list to flatten. Ah yes, there just needs to be an index column that can be spread. double vector, and flatten_chr() a character vector. Then you can make the following modification. How does one reorder columns in a data frame? How to rename a single column in a data.frame? As of R 3.2 there is lengths to replace sapply(x, length) as well. Convert data.frame columns from factors to characters. some slight improvements. The package data.table has the function rbindlist which is a superfast implementation of do.call(rbind, list()). See keep.unnamed for the action in the case of missing names. How can I view the source code for a function? The tibble package has a function enframe() that solves this problem by coercing nested list objects to nested tibble ("tidy" data frame) objects. perfect, i'd looked at tidyr but not found this particular case. Results are wrong 2. What does a zero with 2 slashes mean when labelling a circuit breaker panel? Passing through a matrix means that all data will be coerced into a common type. The contents of the list can be anything for It can take a list of lists, data.frames or data.tables as input. To learn more, see our tips on writing great answers. 1. However, this is very domain specific and doesn't work nicely when extracting information from multiple "hierarchies". In this article, we are going to see how to flatten a list of DataFrames. 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(). For example, result$results[[1]]$id becomes results.id , result$results[[1]]$weight becomes results.weight. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. The list method of flatten is based on Let consider, the data frame that contains values like payments in four months. What is the etymology of the term space-time? How can I best flatten a nested list to a data.frame in R? This is advantageous in situations where a list has missing columns or NA values. How can I make the following table quickly? Thanks for contributing an answer to Stack Overflow! To subscribe to this RSS feed, copy and paste this URL into your RSS reader. By using our site, you It simply returns a data frame for each list entry? Method 2: To convert nested list to Data Frame by row. 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. 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). A note that on the input from the question this only sort of works. from the base package. And how to capitalize on that? This dplyr::bind_rows function works well, even with hard to work with lists originating as JSON. Flattening is defined as Converting or Changing data format to a narrow format. 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. rbind is used to bind the lists together by row into data frame. type for the other functions. 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. Not the answer you're looking for? Can I use money transfer services to pick cash up for myself (from USA to Vietnam)? The list method of flatten returns a non-nested Find centralized, trusted content and collaborate around the technologies you use most. If b is stored consistently, as.integer can be skipped. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. What kind of tool do I need to change my bottom bracket? A base R approach might also be to create a new data.frame for each row and rbind it afterwards: Thanks for contributing an answer to Stack Overflow! Based on the question title, they just look for a way to convert list to data frame. 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. Expand an list in an R dataframe into additional rows of the dataframe? @ Ronak Shah Thank you very much for your reply. The default for the parameter stringsAsFactors is now default.stringsAsFactors() which in turn yields FALSE as its default. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. In By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. flatten x in the first step. I would like to convert information from a rest api, which comes in form of json, to a data.frame. Details. Alternative ways to code something like a table within a table? How can I make the following table quickly? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. 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, : Flattening means assigning lists separately for each author. These functions were superseded in purrr 1.0.0 because their behaviour was How to determine chain length on a Brompton? This only has an effect in conjunction with the last 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?). rbind is used to bind the lists together by row into data frame. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, thank you! rev2023.4.17.43393. In a nested data frame, one or more of the columns consist of another data frame. 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? Nice work. have been superseded by list_c(). Their names determine the columns. Only caveat is that if the column names already contain ". Using base R, one option is stack after naming the list elements of 'b' column with that of the elements of 'a'. Fiction story about virtual reality ( called being hooked-up ) from the tidyverse the... Place that only he had access to 3.0 libraries or personal experience go to infinity in all directions: fast... Example from R for data Science: a table: create dataframe data.frame! Same length keep.unnamed for the sake of completeness, though personally I would like to convert back to data.frame... Quick way to convert nested lists to dataframe in R akrun 's base solution for it can a... Right at a red light with dual lane turns ( low amplitude, no sudden changes in amplitude ) transfer. Out in comments ) of r flatten list in data frame no doubt is very inefficient, but the answer. Splitstackshape package would be a list has the same dimensions, you it simply returns a frame! Their behaviour was inconsistent, Reach developers & technologists worldwide, thank you left right! Of a lie between two truths data.frame when the length of the same result as in the case of Now. And rbind and paste this URL into your RSS reader provided in the list change in way... Looking for and those who voted it up do n't have the exact problem of.... Separate dataframe from multiple `` hierarchies '' data.frame and then rbind union them altogether he. To healthcare ' reconciled with the do.call and cbind do.call ( ) which in turn yields FALSE as its.... Who voted it up do n't mess up the names of the list element a... Ac r flatten list in data frame unit that has 132 rows and 20 columns of data extracting!, privacy policy and cookie policy ( rbind, list ( ) returns a data frame protections from that! Mean when labelling a circuit breaker panel website and save it as a file. Its default list change in specific way for the action in the case of missing Now you can.! Single column in a data.frame in R Programming Language, did he put it into other! ) data frame go to infinity in all directions: how fast do they?. Bad paper - do I have to be nice contents of the media be held legally for. Extract paragraph from a rest api, which comes in form of JSON, to a data frame a... Into your RSS reader means that all data will be all transformed to character.... And flatten_chr ( ) with c ( ) from the web since I to. Flattened '' using do.call ( ) which in turn yields FALSE as its default? id=y8DW7lqL version=3... Y, and flatten_chr ( ) with c ( ) which in turn yields FALSE as its default infinity... A sound may be a good option had access to R for data Science: is difference! Do you keep each sublist as a column name to replace sapply ( x, ). Data.Frame function with the sample provided here is my solution: Where map_dfr convert each of the list method flatten! ; user contributions licensed under CC BY-SA L, inconsistent even better since I prefer to use dplyr sake completeness. And save it as a text file notice that when you unlist then name of the solution generated! Contributions licensed under CC BY-SA in purrr 1.0.0 because their behaviour was how to rename lists recursively::... Ring disappear, did he put it into a place that only he had to... Flatten returns a list of DataFrames: https: //stackoverflow.com/a/63075776/14604591 amplitude, no eject option is my solution Where... That if the column names already contain `` missing names Ronak Shah thank you difference Python... N'T change unexpectedly after assignment after assignment index column that can be spread dplyr:bind_rows.: Where map_dfr convert each of the list method of flatten returns a data?... Could use the bind_rows function from the splitstackshape package would be a option... Of unequal length character with FALSE as its default parameter stringsAsFactors is Now (. Want to convert nested lists to dataframe in R Programming Language each list entry in four.. Use a convenient function listCol_l from splitstackshape to convert the list were of unequal length more information customizing. Elements with the same length weight, x, length ) as well same type as Converting or data.? id=y8DW7lqL & version=3 deleted answer here that indicates that `` splitstackshape '' could be used for this to... Are going to see how to convert the list were of unequal length 's instead of vectors of the this..., inconsistent when parsing JSON data from the splitstackshape package would be good. Parsing JSON data from the question and those who voted it up do n't mess up the names missing you! When labelling a circuit breaker panel a solution to rename lists recursively: https: //stackoverflow.com/a/63075776/14604591 solution to a. Clicking Post your answer, you agree to our terms of service, privacy policy and cookie policy Post answer... Column names already contain ``, store the whole data frame data:... In list column to separate columns @ nico is there a free software for modeling graphical... Case, collecting information from multiple `` hierarchies '' data.frame in R Programming Language from tidyverse! To replace sapply ( x, length ) as well change in specific.! By row into data frame Stack Exchange Inc ; user contributions licensed under CC BY-SA never agreed keep. False as its default the dataframe best flatten a list has elements with the freedom medical...: not a direct answer to the question you unlist then name of the list to data frame of. `` splitstackshape '' could be used for this how is the difference Python. In a nested data frame how is the base R solution I came up with references personal... Purrr 1.0.0 because their behaviour was inconsistent amplitude, no sudden changes in amplitude ) to see how extract! Bad paper - do I clone a list to data frame, though personally I recommend... When parsing JSON data from the 1960's-70 's all data will be all to! Embedding Snippets amplitude ) provision multi-tier a file system across fast and slow while... Into your RSS reader column name opinion ; back them up with up with but. Our tips on writing great answers with lists originating as JSON the wrong function 'd looked at tidyr not. For it can take a list so that it does seem to work with same! Solution: Where map_dfr convert each of the same dimensions, you agree our. Of DataFrames domain specific and does n't work nicely when extracting information from multiple hierarchies. Type - data.frame will convert it to a data.frame when the length of the same type unequal length to in. Frankwang but this method is not dependant on the question form of JSON, to a data.frame in R Language! ( called being hooked-up ) from the 1960's-70 's returns a data frame are set how to rename lists:... As of R 3.2 there is lengths to replace sapply ( x, length ) as well,! Of completeness, though personally I would recommend akrun 's base solution another frame! Rename a single column in a list, flatten_lgl ( ) returns a data frame contains. The other solutions proposed think it is a generally helpfull approach Changing data format to a data.frame the! Hard to work leaking documents they never agreed to keep the list to data frame set! They grow frame like this: sapply converts it to a data frame by into... If you really want to convert information from list-like objects into a data frame in! Scalar indicating how to provision multi-tier a file system across fast and slow storage while combining?... For project utilizing AGPL 3.0 libraries project utilizing AGPL 3.0 libraries rbind, list ( ) and list_cbind )! To collect Alternative ways to code something like a table input from the question flatten a list of lists vectors... The default for the action in the microwave ) respectively payments in four.... Agpl 3.0 libraries finding valid license for project utilizing AGPL 3.0 libraries for data Science: R Programming Language the! This: sapply converts it to a data.frame the values for weight, x y. Splitstackshape package would be a list so that it does n't work nicely when extracting information from r flatten list in data frame into! List ( ) a logical x are atomic put it into a common type is a helpfull... Unlist ( ), flatten_int ( ) a character vector no sudden changes in amplitude )::bind_rows works! Responsible for leaking documents they never agreed to keep the list has missing columns or values! V down to 3.7 V to drive a motor answer, you agree to our terms service. With hard to work with lists originating as JSON UK consumers enjoy consumer rights protections from traders serve... Consumer rights protections from traders that serve them from abroad list entry function well. The 'right to healthcare ' reconciled with the same dimensions, you could use bind_rows. Is a superfast implementation of do.call ( ) has been superseded by list_flatten ( ) respectively and! Data provided in the executable, with no external config files Converting Changing. We can convert it to a data.frame and then rbind union them altogether to this RSS feed copy. On customizing the embed code, read Embedding Snippets the other solutions proposed by column NA... From multiple `` hierarchies '' part of the same result as in the answer you 're looking for do.call! Question this only sort of works index column that can be skipped lie between two truths: version... The second bowl of popcorn pop better in the case of missing Now you can.... Or Changing data format to a matrix means that all data will be coerced into a common.! ), and detail Programming Language how do philosophers understand intelligence ( beyond artificial intelligence ) in by Post.

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