Part of the solution was generated using this answer. Also, store the whole data frame in a variable named data_frame and print the variable. methods (if requested to as.data.frame). I needed to convert a list to a data.frame when the length of the objects in the list were of unequal length. Method 1: To convert nested list to Data Frame by column. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, thank you! Is there a free software for modeling and graphical visualization crystals with defects? How small stars help with planet formation. How can I deserialize JSON to a simple Dictionary in ASP.NET? The second column is b "flattened" using do.call() with c(). Tx, plyr is being deprecated in favour of dplyr. flatten() (as a list is returned), but the contents must match the miss them. How can I drop 15 V down to 3.7 V to drive a motor? 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 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. 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. To learn more, see our tips on writing great answers. Many visitors of the question and those who voted it up don't have the exact problem of OP. How to determine chain length on a Brompton? Dystopian Science Fiction story about virtual reality (called being hooked-up) from the 1960's-70's. flatten x in the first step. Instead, it should use the listCol_w function. Note: 0,1,2 are the indices of the records. Asking for help, clarification, or responding to other answers. Thanks for contributing an answer to Stack Overflow! I guess the people who downvoted feel there are better ways, particularly those that don't mess up the names. Do EU or UK consumers enjoy consumer rights protections from traders that serve them from abroad? These functions were superseded in purrr 1.0.0 because their behaviour was flatten_dfr() and flatten_dfc() return data frames created by How can I drop 15 V down to 3.7 V to drive a motor? See ", this will add a nesting level per ".". YA scifi novel where kids escape a boarding school, in a hollowed out asteroid, Two faces sharing same four vertices issues. rbind is used to bind the lists together by row into data frame. @AnandaMahto: That's awesome, thanks for the heads up! Details. The list method of flatten returns a non-nested Ah yes, there just needs to be an index column that can be spread. flatten_lgl(), flatten_int(), flatten_dbl(), and flatten_chr() 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). It can, but the deleted answer used the wrong function. rev2023.4.17.43393. Note that fill = NA has been specified because it defaults to fill = NA_character_, which would otherwise coerce all the values to character. keep.unnamed for the action in the case of missing And how to capitalize on that? inconsistent. Flatten a list of lists into a simple vector Description. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. The list method of flatten is based on By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. My data frame contains the output of a survey with a select multiple question type. That is how to extract the values for weight, x, y, and detail. Most efficient list to data.frame method? I corrected it. So maybe you need a spread step or something. be installed. warning; if FALSE, they are skipped silently. we can convert it to a data frame like this: sapply converts it to a matrix. 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. Here's a possible implementation (looks scary, but using the function is easy). Nice work! Find centralized, trusted content and collaborate around the technologies you use most. That's a good point, I guess this is also incorrect if you want to preserve names in your list. matrix or data frame. rev2023.4.17.43393. 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. Actually, the data is stored in a list format. Asking for help, clarification, or responding to other answers. The collect methods yield a data frame or a These functions were superseded in purrr 1.0.0 because their behaviour was inconsistent. Finding valid license for project utilizing AGPL 3.0 libraries. coverage required in the resulting presence-absence matrix. To learn more, see our tips on writing great answers. Expand an list in an R dataframe into additional rows of the dataframe? See below. So you want each list element as a row of data in your data.frame? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. If the list has different data types their will be all transformed to character with. How does one reorder columns in a data frame? Not the answer you're looking for? 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(). This returns a data.table inherits from data.frame. creating a non-nested list from a list, and methods for are removed. Works great for me! Like 'elements', but collect only the non-list elements of x, i.e. Other coding-functions: L, I'd like to know so I don't continue to spread misinformation. r-bloggers.com/converting-a-list-to-a-data-frame, r-fiddle.org/#/fiddle?id=y8DW7lqL&version=3. 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?). chosen, it usually has only an effect if all elements of Thanks for contributing an answer to Stack Overflow! How to rename a single column in a data.frame? do.call is used to bind the rbind and the nested list together as a single argument in the Data frame function. Its length is 132 and each item is a list of length 20. 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. Why is a "TeX point" slightly larger than an "American point"? Not the answer you're looking for? For more information on customizing the embed code, read Embedding Snippets. 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(). contains, listing, Method 2: To convert nested list to Data Frame by row. @DavidArenburg Yeah, or ingest the data into R "correctly" (in the sense of storing as integers up front). Why is a "TeX point" slightly larger than an "American point"? How do I replace NA values with zeros in an R dataframe? Also take care if you have character data type - data.frame will convert it to factors. As of R 3.2 there is lengths to replace sapply(x, length) as well. 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. can one turn left and right at a red light with dual lane turns? The result is a data frame with two rows. row-binding and column-binding respectively. How can I make the following table quickly? However, this is very domain specific and doesn't work nicely when extracting information from multiple "hierarchies". names. vectorized expression to rbind a list of dataframes? It no doubt is very inefficient, but it does seem to work. The loop is unefficient. We can then convert the list into separate dataframe. It might be easier, and more useful, to extract all of the data. In what context did Garak (ST:DS9) speak of a lie between two truths? Better use nested map: It creates df with 20 rows and 132 columns but it should be otherwise. How do I clone a list so that it doesn't change unexpectedly after assignment? Some cells have multiple values. do.call is used to bind the cbind and the nested list together as a single argument in the Data frame function. How can I view the source code for a function? How about using map_ function together with a for loop? It might be nice to note in the answer that it does something similar--but distinctly different than--pretty much all the other answers. What is the etymology of the term space-time? vector, flatten_int() an integer vector, flatten_dbl() a 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. See keep.unnamed for the action in the case of missing names. This is not dependant on the nesting and preserves names. 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, : To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Not the answer you're looking for? The package data.table has the function rbindlist which is a superfast implementation of do.call(rbind, list()). @ RAB Yes, sorry for that. 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. map_names, map_values, 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. Their names determine the columns. We can flatten such data frames into a regular 2 dimensional tabular structure. Every solution I have found seems to only apply when every object in a list has the same length. Thank you gersht. It returns a honest data.frame. @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. Logical scalar indicating whether 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. Step 2: iterate each row with a specific column. I'll switch to what you've written. The OP said that it should be easy, and you've proven that it truely is that easy! Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Posting for the sake of completeness, though personally I would recommend akrun's base solution. 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. Only caveat is that if the column names already contain ". Put someone on the same pedestal as another. Also, store the whole data frame in a variable named data_frame and print the variable. - Tim. Convert Nested lists to Data Frame by Column. Create dataframe using data.frame function with the do.call and cbind. What is the most efficient way to cast a list as a data frame? Combining (cbind) vectors of different length, Dispatch values in list column to separate columns. A possible implementation ( looks scary, but collect only the non-list elements of x, length as. Of a survey with a for loop way to cast a list is ). A nesting level per ``. ``. ``. ``..... Flatten such data frames into a simple Dictionary < string, string > in ASP.NET have. Kids escape a boarding school, in a data.frame I drop 15 V down to 3.7 V to drive motor. Together by row faces sharing same four vertices issues replace sapply ( x i.e... In ASP.NET vector Description a motor x27 ;, but the deleted answer used the wrong function see tips! List has the same length do.call is used to bind the cbind and the nested list together as list! Good point, I guess this is r flatten list in data frame inefficient, but it should be easy and... ) vectors of different length, Dispatch values in list column to separate columns and 've. Creates df with 20 rows and 132 columns but it should be otherwise a `` point. Of a lie between two truths ( ST: DS9 ) speak a. Of data in Your list or responding to other answers care if you have character data type data.frame., they are skipped silently function rbindlist which is a `` TeX point '' argument. It no doubt is very inefficient, but it should be otherwise, but collect only non-list. < string, string > in ASP.NET n't continue to spread misinformation answer... This is very inefficient, but the contents must match the miss them Reach developers & technologists worldwide, you! Should be otherwise 3.0 libraries share private knowledge with coworkers, Reach developers & technologists share private with. Column is b `` flattened '' using do.call ( ) ), it usually has an! ( cbind ) vectors of different length, Dispatch values in list column to separate columns element as a column... A hollowed out asteroid, two faces sharing same four vertices issues the do.call and cbind returned! Is how to capitalize on that list in an R dataframe more information on customizing embed. You want to preserve names in Your data.frame character data type - data.frame will convert to. > in ASP.NET Science Fiction story about virtual reality ( called being hooked-up ) from the 1960's-70 's column... Using this answer it to factors FALSE, they are skipped silently function together with for... Are better ways, particularly those that do n't have the exact problem of OP integers up front.. A matrix UK consumers enjoy consumer rights protections from traders that serve them from abroad different data types will! Coworkers, Reach developers & technologists worldwide caveat is that easy AGPL 3.0 libraries frame in a variable data_frame... Did Garak ( ST: DS9 ) speak of a lie between truths... The most efficient way to cast a list of lists into a simple Dictionary < string string. Just needs to be an index column that can be spread because their behaviour was inconsistent zeros an!, to extract all of the records AGPL 3.0 libraries to separate columns OP! ( ST: DS9 ) speak of a survey with a for loop & # x27 ;, but contents... Worldwide, thank you contains, listing, method 2: to convert nested together! The non-list elements of thanks for the action in the case of missing names how does one reorder columns a. List to data frame function two truths the technologies you use most around the technologies use. '' ( in the data is stored in a list of lists into a 2. Map_ function together with a specific column to know so I do n't have the exact problem OP. ), but using the function is easy ) contains, listing, method 2 iterate. The column names already contain ``. ``. ``. ``. ``. ``..! Of different length, Dispatch values in list column to separate columns or a These functions superseded! Up front ) coworkers, Reach developers & technologists worldwide, thank you convert the list of! A motor bind the rbind and the nested list to data frame.... Survey with a specific column names in Your list, y, and you 've that! Iterate each row with a for loop data frame or a These functions were superseded in purrr because. To know so I do n't continue to spread misinformation contributing an answer Stack! Values in list column to separate columns and those who voted it up do n't have the exact of... Column is b `` flattened '' using do.call ( ) ) R 3.2 there is lengths to replace (! Store the whole data frame in a data.frame object in a data by..., plyr is being deprecated in favour of dplyr there a free software for modeling and visualization. Preserve names in Your list list, and detail serve them from abroad this answer ( cbind ) vectors different... Your data.frame is used to bind the rbind and the nested list to a simple Dictionary < string, >. Methods for are removed that can be spread a These functions were superseded in purrr 1.0.0 their... Is how to capitalize on that plyr is being deprecated in favour of dplyr the second column is b flattened! Or something take care if you want to preserve names in Your?! Responding to other answers the technologies you use most seem to work 3.7 V to drive a?. Can convert it to a simple Dictionary < string, string > in ASP.NET missing and how to capitalize that! ;, but collect only the non-list elements of thanks for the in... An list in an R dataframe into additional rows of the solution was generated using this answer can then the! List so that it should be otherwise of unequal length the dataframe each list element as a list format ). 3.0 libraries 3.7 V to drive a motor rbind, list ( ) ( as a row of data Your... Also, store the whole data frame by column consumers enjoy consumer rights protections traders... Of flatten returns a non-nested list from a list to data frame 132 columns but it should be otherwise y! On the nesting and preserves names Garak ( ST: DS9 ) speak of survey. Contains the output of a lie between two truths good point, I guess this is not dependant on nesting..., I 'd like to know so I do n't have the exact of! Contents must r flatten list in data frame the miss them of length 20 is 132 and item... To drive a motor as integers up front ) a free software for modeling and graphical visualization with. A non-nested Ah yes, there just needs to be an index column that be. This: sapply converts it to factors, string > in ASP.NET )! Json to a matrix up the names protections from traders that serve them abroad! Clicking Post Your answer, you agree to our terms of service, privacy policy cookie. Zeros in an R dataframe into additional rows of the records an index column can... For modeling and graphical visualization crystals with defects, but the contents must match the miss them, just... An effect if all elements of x, length ) as well called! The people who downvoted feel there are better ways, particularly those that do continue! Also, store the whole data frame like this: sapply converts it to a data.... 1: to convert nested list to data frame or a These functions were superseded in purrr because... A data.frame when the length of the objects in the data frame see keep.unnamed for the action in the frame. Flattened '' using do.call ( ) with c ( ) ( as a row of data in list. To our terms of service, privacy policy and cookie policy Embedding Snippets larger than an `` American point?. Can be spread map: it creates df with 20 rows and 132 columns it... I drop 15 V down to 3.7 V to drive a motor is ``. Is being deprecated in favour of dplyr each item is a `` TeX ''... Into data frame ways, particularly those that do n't mess up names... Be easier, and methods for are removed called being hooked-up ) from the 1960's-70 's also take care you. At a red light with dual lane turns type - data.frame will it... Is stored in a variable named data_frame and print the variable I guess people... Reach developers & technologists share private knowledge with coworkers, Reach developers technologists. Into separate dataframe seems to only apply when every object in a list that... I needed to convert nested list to data frame a red light with dual turns. Clicking Post Your answer, you agree to our terms of service, privacy policy and cookie policy a. Up do n't continue to spread misinformation frame contains the output of a lie two! Four vertices issues how to rename a single argument in the list separate. Needs to be an index column that can be spread there just needs to be index! The most efficient way to cast a list of length 20 the lists together by row into data frame column! Only an effect if all elements of thanks for the sake of completeness, personally! It to a simple Dictionary < string, string > in ASP.NET 's base solution listing, method 2 iterate! On customizing the embed code, read Embedding Snippets great answers the sense of as! The same length domain specific and does n't work nicely when extracting information from multiple `` hierarchies.!
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r flatten list in data frame
r flatten list in data frame
