How to concatenate all the variables of two different matlab files? Cannot concatenate the table variable 'epoch' because it is a cell in one table and a non-cell in another. And yes, those are the "only" 17 .mat files I have in that folder. What is this fallacy: Perfection is impossible, therefore imperfection should be overlooked. I have two mat files with identical list of variables. the number of variables in each. Possibly, each of these only contain one variable, a table but that's not what you've actually described. 'rm' is not a string, it's a character vector, so the cell array you edited in is not a cell array of character vectors. your location, we recommend that you select: . If it is the case, %list of files containing the tables, possibly obtained by dir, %cell array to receive the table contained in each file. Note that in order to concatenate the tables they will have to have the same variables but unique rows. This gives an error: How can I merge all these tables into a single one, so it vertically concatenates rows? offers. your location, we recommend that you select: . For example, if Tleft has variables named Key1 and Var1, and Tright has variables Key1 and Var2, then T=join (Tleft,Tright) uses Key1 as a key variable. A table join appends rows from the right table where its key variables match values in the key variables of the left table. In the cases of different variables I'd want to pad values with NaN. It helps us in combining data present in different cells. In the cases of different variables I'd want to pad values with NaN. Concatenate Tables with one variable having different lengths - MATLAB Answers - MATLAB Central Concatenate Tables with one variable having. Mathematica cannot find square roots of some matrices? 3 Comments Show 2 older comments Douglas Novaes on 12 Sep 2022 Perfect! Based on MATLAB Video 4: Basic Strings, Concatenating Strings, and. Reload the page to see its updated state. not concatenate the table variable 'Var1' using VERTCAT. Would salt mines, lakes or flats be reasonably found in high, snowy elevations? There is no matlab function to do this, you need to open all individual vectors, combine them in the way you want, and save them back to disk. All merge the rows of the table which have identical key but they all behave differently with regards to rows that don't match or when there are several match. For each iteration, I obtain the pertinent Time_x variable by manually building the name of the variable in a string, and then allocating it to CurTime using the eval function. https://www.mathworks.com/matlabcentral/answers/323153-how-to-vertically-concatenate-two-tables-with-different-sizes, https://www.mathworks.com/matlabcentral/answers/323153-how-to-vertically-concatenate-two-tables-with-different-sizes#comment_425850, https://www.mathworks.com/matlabcentral/answers/323153-how-to-vertically-concatenate-two-tables-with-different-sizes#answer_253165, https://www.mathworks.com/matlabcentral/answers/323153-how-to-vertically-concatenate-two-tables-with-different-sizes#answer_490219. AA.mat, etc. Unable to complete the action because of changes made to the page. The Join Tables task lets you interactively combine two tables by performing joins or by concatenating the tables horizontally or vertically. For example: A = Theme Copy var1 var2 ____ ____ 1 2 B = Theme Copy var1 var3 ____ ____ 1 3 C=somefunction (A,B) C = Theme Copy var1 var2 var3 ____ ____ ____ 1 2 NaN Does the following code snippet help to solve your problem? T2 = table('DoubleAlpha',. The example expected result is C. In this example Type doesnt exist for A, then in C it is replaced by Nan. If you know the size of All beforehand, then you can pre-allocate it. filecontent = load(fullfile(folder, filelist{fileidx})); 'File %s contains more than one variable', %check that there is only one variable in the file. I want to split it into three different tables based on variables in the first column. In addition, for tables, the variable names must be identical. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. You need to explain better what you have. How to concatenate string variables in Bash, Concatenate multiple files but include filename as section headers, How to concatenate (join) items in a list to a single string, Import multiple CSV files into pandas and concatenate into one DataFrame, Concatenating matrices from different .mat files with same variable names, If he had met some scary fish, he would immediately return to the surface. I would like to vertically concatenate these two files. Peter Perkins on 23 Nov 2016 6 Adriano, to horizontally concatenate anything in MATLAB, you would probably just use square brackets, right? assignin, mentioned in an earlier answer) to utilise this variable name. All variables with the same names in both tables are key variables. To store text data in a table, use a string array or a cell array of character vectors rather than character arrays. Why does Cauchy's equation for refractive index contain only even power terms? You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. If they do not have unique rows then you can easily loop over the fields of that structure to add a new variable to each table, or change one of the row values, or whatever you want: S = load (. Thanks for contributing an answer to Stack Overflow! Thanks for the response. Would it be possible, given current technology, ten years, and an infinite amount of money, to construct a 7,000 foot (2200 meter) aircraft carrier? Accelerating the pace of engineering and science. Theme. This doesn't work for me, all the variables of the second table are merged into a single variable with multiple columns in the concatenated table. You will have to use eval or another function (e.g. Each of these file could contain any number of variables. Thank you! Other MathWorks country How to concatenate variables in different matlab files? Features may be specific structures in the image such as points, edges or objects. You might have intended to create a one-row table with the character vector 'Alpha' as one of its variables. table is a data type suitable for column-oriented or tabular data that is often stored as columns in a text file or in a spreadsheet. Certainly if your code contains 10 different calls to eval then you're probably doing it wrong. fulltable{fileidx} = filecontent. Not the answer you're looking for? Why doesn't Stockfish announce when it solved a position as a book draw similar to how it announces a forced mate? sites are not optimized for visits from your location. 'VariableNames', {'Var1' 'Var2' 'Var3'}) A = Var1 Var2 Var3 ____ ____ ____ If the variable already exists, then MATLAB replaces the original content with new content and allocates new storage space, where necessary. Learn more about table, concatenate MATLAB I am trying to concatentate two tables within which the first variable is a string of different lengths, between tables. Based on I have a series of tables (AA.mat, BB,mat, CC.mat, etc17 in total), each of them with diiferent number of rows but same number of variables (24x4, 21x4, 3x4, 29,x4, etc.). Such files are called SCRIPT FILES. Later versions than yours reject your input syntax because of ambiguity about options versus inputs. MathWorks is the leading developer of mathematical computing software for engineers and scientists. Such as AB = [A B]. If you are looking at joining the table, then there are different types of joins: left outer join, right outer join, full outer join, inner join, and plain join. Such as AB = [A B]. You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. Choose a web site to get translated content where available and see local events and Accelerating the pace of engineering and science. I am trying to concatenate several similar tables that have mostly the same variables, but a few differences. Each variable in a table can have a different data type and a different size with the one restriction that each variable must have the same number of rows. Secondly, the fields are assigned in alphabetical order, which means that force will always be the first field, and time the second field. Walter Roberson on 13 Jun 2022 The code is expecting that when the file is read, that any variable names in the text will be replaced with the value of the variable. You can use two nice properties of the load command for this task. all these tables are imported from excel . OK, thank you. The error message for your syntax in modern versions is. Accelerating the pace of engineering and science. It took me a few minutes to find the right command. How can I vertically concatenate A and B like the following? The goal of this interaction is to allow effective operation and control of the machine from the human end, while the machine simultaneously feeds back information that aids the operators . Gabe, hacking outerjoin to do vertical concatenation is super clever, but I think it isn't going to work for you, because the common variables that you'd use as the "key" (Var1 in your example) have values in common. ); How do I concatenate two lists in Python? 2. "how can I download all these tables automatically (instead of manually, as I have done here) and then concatenate them into one single table? You may receive emails, depending on your. Unable to complete the action because of changes made to the page. file and their names, then we could tailor the code even more closely to your use case. Asking for help, clarification, or responding to other answers. thanks. Other MathWorks country , where each table is the concatenation of the 4 variables (that's what you appear to ask)? Would like to stay longer than 90 days. How to vertically concatenate two tables with different sizes Follow 135 views (last 30 days) Show older comments Mars on 3 Feb 2017 Edited: Sterling Baird on 5 Sep 2020 Accepted Answer: Walter Roberson For example: >> A = table ( ['A1';'A1';'A1'], [1;1;1], [1;1;1],. Thank you! Find the treasures in MATLAB Central and discover how the community can help you! MathWorks is the leading developer of mathematical computing software for engineers and scientists. Essentially what is happening is I'm looping over the suffixes of Time_1, Time_2, and Time_3. MATLAB documentation has detailed examples of using this function with an exclusion list (for ensuring unique variable names). In file1.mat Variables Time [100X1] double Force [100x1] double In file2.mat Variables Time_1 [90X1] double Alternatively, create a cell array with one row, and convert that to a table using CELL2TABLE. Adriano, to horizontally concatenate anything in MATLAB, you would probably just use square brackets, right? ", If you gave us more useful information, e.g. offers. I'd like to concatenate vertically several tables with common and uncommon columns: in this example code columns is common to A and B but not the others. If it is the case, Theme Copy filelist = {'AA.mat', 'BB.mat', '.'}; %list of files containing the tables, possibly obtained by dir your location, we recommend that you select: . I am trying to concatentate two tables within which the first variable is a string of different lengths, between tables. Is there an additional argument or way to initialize an empty table to permit. 63 views (last 30 days) Show older comments Prasanna Srisailan on 24 Sep 2012 0 Translate Accepted Answer: Image Analyst I have two mat files with identical number of variables. Theme Copy T1 = table ('Alpha', 33, 6); % Create first table T2 = table ('DoubleAlpha', 36, 8); % Create second table TT = vertcat (T1,T2); % Concatenate tables This gives an error: Theme Copy Other MathWorks country Possibly, each of these only contain one variable, a table but that's not what you've actually described. Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content. The Problem I am running into is, I have 100+ variables and I would like to keep the variable names of the first file (i.e variable without the suffix) without introducing a new variable. In the United States, must state courts follow rulings by federal courts of appeals? (varlist{1}); %extract the one variable in the cell array, %check that the one variable is indeed a table. For instance I tried to concatenate two tables A (size 32x4) and B (size 32x50) and I ended up with AB (size 32x5) where the fifth variable has 50 columns!.. On the Editor or Live Editor tab, in the Section section, click Run Section. Unable to complete the action because of changes made to the page. TT = vertcat (T1,T2); % Concatenate tables. Was the ZX Spectrum used for number crunching? Or do you want to produce 4 tables, one for each. }; data = cell (length (filenames), 1); % cell array to store all vectors for i = 1:length (filenames) var = load (filenames . Connect and share knowledge within a single location that is structured and easy to search. MathWorks is the leading developer of mathematical computing software for engineers and scientists. Is the EU Border Guard Agency able to tell Russian passports issued in Ukraine or Georgia from the legitimate ones? Choose a web site to get translated content where available and see local events and In my example, there are only 2 tables with one common column. Are the S&P 500 and Dow Jones Industrial Average securities? Just saw this other thread asking pretty much the same question, https://www.mathworks.com/matlabcentral/answers/323153-how-to-vertically-concatenate-two-tables-with-different-sizes?s_tid=answers_rc1-1_p1_MLT. How do I arrange multiple quotations (each with multiple lines) vertically (with a line through the center) so that they're side-by-side? Same for tables. My understanding: you have 17 mat files (with absolutely rubbish names! Sign in to comment. What is the highest level 1 persuasion bonus you can have? Of course, this code is not very efficient as All is growing within the loop. . Then simply perform the desired concatenation using CurTime. Find the treasures in MATLAB Central and discover how the community can help you! sites are not optimized for visits from your location. Combining these properties, you can do the following: Note that if your files are called file1file10, instead of file001file010, the alphabetical ordering you get from using the dir command may not be ideal. To answer the question completely, I am trying to concatentate two tables within which the first variable is a string of different lengths, between tables. You can of course add variables to either table until all the variable names match: Theme Copy How can I refer the variables and concatenate them in a loop so I don't have to open the file every time and enter the variable names in vertcat? Dual EU/US Citizen entered EU on US Passport. Features may also be the result of a general neighborhood operation or feature detection applied to the image. Am investigating dynamic field names to use with large number of unknown variables. Does integrating PDOS give total charge of a system? At least until someone puts Theme Copy system ('format C:\') into an input file for the lulz. MathWorks is the leading developer of mathematical computing software for engineers and scientists. number = 100 string = 100 digit = 0 digit = 0 In the above output, we can see that converting a number to a string can be helpful in some cases . Secondly, the fields are assigned in alphabetical order, which means that force will always be the first field, and time the second field. In the industrial design field of human-computer interaction, a user interface ( UI) is the space where interactions between humans and machines occur. Copy. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. rev2022.12.11.43106. Method 1 Table3 = join (Table1,Table2,'Keys','SysTime') The above is not successful as the key variable for B must contain all values in the key variable for A. Reload the page to see its updated state. of those four variables do you wish to load and concatenate? The matlab documentation states that the first term in the bracket after splittaply should be a function such as @max. mat files, variables, and tables are completely different things. Learn more about concatenate tables MATLAB I am trying to concatenate several similar tables that have mostly the same variables, but a few differences. Something like this (untested): filenames = {'file1.mat', 'file2.mat', . Based on In addition, for tables, the variable names must be identical. The task automatically generates MATLAB code for your live script. Each of these file could contain any number of variables. each of these 17 mat files contain 4 variables always named participant, mean_RT, RT_date, RT_time, possibly these variables are tables your location, we recommend that you select: . A table join appends rows from the right table where its key variables match values in the key variables of the left table. offers. I will like to concatenate the four of them into a single table. T2 = table ('DoubleAlpha', 36, 8); % Create second table. Accelerating the pace of engineering and science. You need to explain better what you have. However, I don't understand what the varagin function is doing. Matlab Cheat Sheet Built in functions/constants Tables So. sites are not optimized for visits from your location. which builds on outerjoin and supports 2+ tables and shared variable names, concatenate two tables with different sizes, You may receive emails, depending on your. Same for tables. Firstly, load with an output argument creates a structure with field names equal to the variable names, which means that you can load data without having to know ahead of time what the variables were named. For example, if Tleft has variables named Key1 and Var1, and Tright has variables Key1 and Var2, then T=join (Tleft,Tright) uses Key1 as a key variable. Zorn's lemma: old friend or historical relic? You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. Find the treasures in MATLAB Central and discover how the community can help you! To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Tables consist of rows and column-oriented variables. How can I concatenate two arrays in Java? Concatenating tables with different format. T1 = table ('Alpha', 33, 6); % Create first table. You can of course add variables to either table until all the variable names match: Theme Copy @Prasanna You can keep the workspace slim by reading each file within the loop, applying the, Its a good start. cat and horzcat provide a functional form of that, but the standard MATLAB way is brackets. T1 = table ('Alpha', 33, 6); % Create first table T2 = table ('DoubleAlpha', 36, 8); % Create second table TT = vertcat (T1,T2); % Concatenate tables This gives an error: All variables with the same names in both tables are key variables. The Matlab expression B=all (A) is translated into Scilab by B=and (A): If A is a matrix, all (A) is equivalent to all (A,1) in Matlab whereas in Scilab and (A) is a logical AND of all elements of A. advection_pde , a MATLAB code which solves the advection partial differential equation (PDE) dudt + c * dudx = 0 in one spatial dimension, with a . Choose a web site to get translated content where available and see local events and You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. file contains the same four variables, and that within any one mat file they all have the same number of rows try something like this: 'path to folder where the .mat files are saved', You may receive emails, depending on your. Return a logical array which is true where the elements of S are whitespace characters (space, formfeed, newline, carriage return, tab, Return the MATLAB compatible maximum variable name length. not tables. Reload the page to see its updated state. cat and horzcat provide a functional form of that, but the standard MATLAB way is brackets. Unable to complete the action because of changes made to the page. Should I exit and re-enter EU with my EU passport or is it ok? Accepted Answer: Walter Roberson. My understanding: you have 17 mat files (with absolutely rubbish names!) Accepted Answer: Walter Roberson I am trying to concatentate two tables within which the first variable is a string of different lengths, between tables. Reload the page to see its updated state. Jayden Yeo This is a great method, and it works too. Let me know if I've misunderstood the problem you're having and I'll try and come up with something more helpful. tables like matrices must have the same number of columns (variables with regards to tables) to concatenate them vertically. More Answers (0) Sign in to answer this question. offers. Also, some people think eval is evil. To add or change weights after creating a graph, you can modify the table variable directly, for example, g. In Matlab (and in Octave, its GNU clone), a single variable can represent either a single It can be used for an arbitrary number of tables, and supports double, char, cell, struct, etc. ), each of these 17 mat files contain 4 variables always named, Now, do you want to produce 17 tables, one for each. Based on are mat files not tables. Concatenation can also be used to combine 2 matrices and create a new matrix of larger size. Or do you want to produce just 1 table, which is the concatenation of all the variables in all of the files? Why is Singapore currently considered to be a dictatorial regime and a multi-party democracy by different publications? Sign in to comment. I think this will explain better my problem: how can I download all these tables automatically (instead of manually, as I have done here) and then concatenate them into one single table? Ready to optimize your JavaScript with Rust? Find the treasures in MATLAB Central and discover how the community can help you! I implemented the following lines of code which work perfectly. sites are not optimized for visits from your location. https://www.mathworks.com/matlabcentral/answers/434241-how-to-concatenate-tables-with-the-same-number-of-variables-but-different-number-of-rows, https://www.mathworks.com/matlabcentral/answers/434241-how-to-concatenate-tables-with-the-same-number-of-variables-but-different-number-of-rows#answer_350896, https://www.mathworks.com/matlabcentral/answers/434241-how-to-concatenate-tables-with-the-same-number-of-variables-but-different-number-of-rows#comment_647155, https://www.mathworks.com/matlabcentral/answers/434241-how-to-concatenate-tables-with-the-same-number-of-variables-but-different-number-of-rows#comment_647159, https://www.mathworks.com/matlabcentral/answers/434241-how-to-concatenate-tables-with-the-same-number-of-variables-but-different-number-of-rows#comment_647165, https://www.mathworks.com/matlabcentral/answers/434241-how-to-concatenate-tables-with-the-same-number-of-variables-but-different-number-of-rows#comment_647181, https://www.mathworks.com/matlabcentral/answers/434241-how-to-concatenate-tables-with-the-same-number-of-variables-but-different-number-of-rows#comment_647189, https://www.mathworks.com/matlabcentral/answers/434241-how-to-concatenate-tables-with-the-same-number-of-variables-but-different-number-of-rows#comment_647201, https://www.mathworks.com/matlabcentral/answers/434241-how-to-concatenate-tables-with-the-same-number-of-variables-but-different-number-of-rows#answer_350905. sometimes Matlab imports the same column as in cells and sometimes as double which is leading to the fol. Here we are reading lines 4 and 7. Choose a web site to get translated content where available and see local events and If the size is unknown before the fact, you can implement the solution here (or else just pre-allocate it as being arbitrarily large and then cut it down to size once the loop is complete). Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Is it cheating if the proctor gives a student the answer key by mistake and the student doesn't report it? Per strcat 's documentation, if any input is a string , then the output is a string , so a is a string. Method 2 Table3 = [Table1 Table2] The above is not successful due to the duplicate name 'SysTime'. tables like matrices must have the same number of columns (variables with regards to tables) to concatenate them vertically. To learn more, see our tips on writing great answers. https://www.mathworks.com/matlabcentral/answers/347635-way-to-concatenate-tables-with-some-but-not-all-variables-in-common, https://www.mathworks.com/matlabcentral/answers/347635-way-to-concatenate-tables-with-some-but-not-all-variables-in-common#comment_467093, https://www.mathworks.com/matlabcentral/answers/347635-way-to-concatenate-tables-with-some-but-not-all-variables-in-common#comment_467122, https://www.mathworks.com/matlabcentral/answers/347635-way-to-concatenate-tables-with-some-but-not-all-variables-in-common#answer_490213. Learn more about table Hi, I am concatenating tables in a large loop. Are defenders behind an arrow slit attackable? The suffix _1 added to the file2 changes to _2 or _32 etc. It's more like merging two data frames based on the need. I am trying to concatenate several similar tables that have mostly the same variables, but a few differences. However, MATLAB does not provide any file reading routines that will do that. Assuming that the data have the same class, that each. I think you'd be safer just finding the setxor of the two lists of var names, and creating the vars you need using NaNs. ) mat files, variables, and tables are completely different things. Firstly, load with an output argument creates a structure with field names equal to the variable names, which means that you can load data without having to know ahead of time what the variables were named. To reproduce the error: A.epoch = [1,2,3]'; A.value = [10,20,30]'; Initialized empty table with headers: Aclean = cell2table (cell (1,2), 'VariableNames', {'epoch', 'value'}); Vertically concatenate the 2 tables: You may receive emails, depending on your. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. MATLAB treats any non-zero value as 1 and returns the logical AND. , where each table is the concatenation of the respective variable in each file (that would make more sense)? RE: your edit, MATLAB's string and char classes are not the same. https://www.mathworks.com/matlabcentral/answers/467349-concatenate-tables-with-one-variable-having-different-lengths, https://www.mathworks.com/matlabcentral/answers/467349-concatenate-tables-with-one-variable-having-different-lengths#answer_379412, https://www.mathworks.com/matlabcentral/answers/467349-concatenate-tables-with-one-variable-having-different-lengths#comment_715303. We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. In that case, you may have to extract the number at the end of the file name and re-order the list. Accepted Answer: Walter Roberson I am trying to concatentate two tables within which the first variable is a string of different lengths, between tables. Envelope of x-t graph in Damped harmonic oscillations, confusion between a half wave and a centre tapped full wave rectifier. At least in your example they do. In computer vision and image processing, a feature is a piece of information about the content of an image; typically about whether a certain region of the image has certain properties. Using this task, you can: Perform joins, including inner and outer joins, on tables by specifying key variables table variables . Other MathWorks country Is there any canned function that does this? In the cases of different variables I'd want to pad values with NaN. I just refactored using some old code I wrote a while ago and based on a. . Thanks! Matlab Concatenate is used to combine 2 or more characters, strings, or elements of the array. Find centralized, trusted content and collaborate around the technologies you use most. Making statements based on opinion; back them up with references or personal experience. of arrays being concatenated are not consistent. The number of variables is always 4, and the names of the variables are 'participant', 'mean_RT', 'RT_date' and 'RT_time'. How to concatenate a std::string and an int. 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