We need a simple easy way of adding and inserting both empty columns and empty rows onto and into tables in Matlab (Mathworks, are you listening?). It takes time and is very unproductive. offers. I had to find a long long way around to solve this simple task. However I created a variable A = ones (3,1) and chose the data on the table to reflect this variable, thus the table size changed to a 3x1 (which is what I would like it to be). Choose a web site to get translated content where available and see local events and is not, and that is what you specify when you specify the 'Size'. >> array2table(zeros(0,5)) Learn more about table MATLAB. Add variables to an existing table by using dot notation. Copy. There are 7 ODE solvers in MATLAB. And, in fact, your own code sample defeats such sanity-checking as may exist. I imagine if I can have named columns in an empty table, the problem can be solved? The default size of a table on matlab appears to be a 4x2. This lists the subscripts for all elements . this is useful for what I'm doing, but what should I use as variable type if I want let's say "x" to be an array of 2 double? I've spent hours fixing Code Analyzer ("m-lint") warnings, in my own code and especially other people's code. 1) I'm all for certain kinds of sanity checks. To sum up, you can round down, up, to the nearest integer, and to X decimal places using the floor, ceil, fix, and round MATLAB functions. your location, we recommend that you select: . You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. Ah I see, then my answer might be useful for people using later versions of matlab. How to Create Recursive Functions in MATLAB. offers. 2) If the goal is to make software accessible to non-experts who make a lot of mistakes, I posit that requiring a. that can get out of sync is contrary to that goal. You may receive emails, depending on your. Sorry guys, but creating a table in matlab should be lot more simple. Assign variables to an empty table. Preallocate a table and fill in its data later. Matlab really gets on my nerv after PHP and VBA, optionsChange = cell2table(cell(0,9), VariableNames, {. In MATLAB, you can create tables and assign data to them in several ways. >> optionsChange = array2table(rand(5,2)); have been extended with rows containing default values. NONE of the answers I have found meet this basic need. For example, create an empty array of the ColorInRGB class defined in the previous section. That form requires you to redundantly enter the size information, which is already implied by the variable names. However I created a variable A = ones(3,1) and chose the data on the table to reflect this variable, thus the table size changed to a 3x1 (which is what I would like it to be). I am trying to initialise a table object of the correct dimension but not initialised with any data. Notice the column number in Date(5,1): that's because Date does not exist and assigning to Date(5) would follow standard MATLAB behavior and create the 5th element of a row vector. Here is a way: Let's say you have the following headers: headers = {'A' 'B' 'C' 'D' 'E'}; Then initialize the data (in your case 10 000 x 5, here 4 x 5) as an empty cell. The problem is that now the table is filled with 1's and I would like the . You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. But Peter Perkins' answer back in 2015 explicitly specifies zero rows. Reload the page to see its updated state. shipt customer service. From your answer I was able to see that it's possible to make a completely empty table with: Though I'm not sure if that's the preferred method. Reload the page to see its updated state. How can you create an empty table object with named columns? Usually, the data type conversion functions are used when you have already created data as one type and want to convert it to another. After you do this and restart the Matlab window use @code {mycode} in the last N blocks get a temporary block table. P.S: Walter Roberson's comment two weeks ago determines the number of columns automatically using. Find the treasures in MATLAB Central and discover how the community can help you! To create an empty 0-by-5 array of class ColorInRGB, call the empty method: A = ColorInRGB.empty (0,5); Identify Empty Arrays You can use the isempty, size, and length functions to identify empty object arrays. Accepted Answer: Adam Danz. We need a simple easy way of adding and inserting both empty columns and empty rows onto and into tables in Matlab (Mathworks, are you listening?). It is empty anyway. MathWorks ist der fhrende Entwickler von Software fr mathematische Berechnungen fr Ingenieure und Wissenschaftler. In MATLAB, you can create tables and assign data to them in several ways. good programming practice, for what MATLAB is intended for. The answer might be "all doubles", but it might not. Based on That also gives a sanity check -- if you say you want a 5-by-6 table with 5 variables MATLAB can note the mismatch and ask you to make a 5-by-5 table or specify 6 variable names. @Nikita Agrawal: sure. To create a table the following steps are used. That may be a good starting point, but strictly speaking it's not what the OP asked for. T = table is going to create a 0x0. If all statements execute successfully, then the database commits the transaction. Reload the page to see its updated state. Create a table from input arrays by using the table function. You might do one of two things. Use the zeros () Function to Create an Empty Matrix in MATLAB Use the eye () Function to Create an Empty Matrix in MATLAB We will look at different ways to create an empty matrix in MATLAB. offers. Choose a web site to get translated content where available and see local events and Accepted Answer: Tom The default size of a table on matlab appears to be a 4x2. Choose a web site to get translated content where available and see local events and aws lambda javascript example; closest nail shop; pehr portable changing pad; she hulk cast episode 4 imdb . Just wondering how you would round numbers in a table. The number of. You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. Empty_table.Properties.VariableNames. Examples collapse all Number of Table Rows Create a table, T. To create a row vector of length 5, filled with ones use >> x = ones(1,5) To create a column vector of length 5, filled with zeros use >> y = zeros(5,1) The linspace and logspace functions create vectors with linearly spaced or logarithmically spaced elements, respectively. https://de.mathworks.com/matlabcentral/answers/112462-how-can-you-create-an-empty-table-object-with-non-zero-rows-or-non-zero-columns, https://de.mathworks.com/matlabcentral/answers/112462-how-can-you-create-an-empty-table-object-with-non-zero-rows-or-non-zero-columns#answer_120946, https://de.mathworks.com/matlabcentral/answers/112462-how-can-you-create-an-empty-table-object-with-non-zero-rows-or-non-zero-columns#comment_228917, https://de.mathworks.com/matlabcentral/answers/112462-how-can-you-create-an-empty-table-object-with-non-zero-rows-or-non-zero-columns#comment_431404, https://de.mathworks.com/matlabcentral/answers/112462-how-can-you-create-an-empty-table-object-with-non-zero-rows-or-non-zero-columns#comment_432834, https://de.mathworks.com/matlabcentral/answers/112462-how-can-you-create-an-empty-table-object-with-non-zero-rows-or-non-zero-columns#answer_256749. To make an empty table, the input cell array must be empty too: You may receive emails, depending on your. your location, we recommend that you select: . Preallocate a table and fill in its data later. But you need a type for each variable. Also, they may already be rounded, and what you're seeing is just the shortg display. That may be faster in the long run, because it doesn't have to keep reallocating memory as the table grows. NONE of the answers I have found meet this basic need. I have a loop that logically does something like this: However, I want to add an assert after each row creation, like this: But since t starts off empty, before I run t{:,{'a'}} I have to check if t is empty. https://www.mathworks.com/matlabcentral/answers/244084-is-there-a-simpler-way-to-create-an-empty-table-with-a-list-of-variablenames, https://www.mathworks.com/matlabcentral/answers/244084-is-there-a-simpler-way-to-create-an-empty-table-with-a-list-of-variablenames#answer_193094, https://www.mathworks.com/matlabcentral/answers/244084-is-there-a-simpler-way-to-create-an-empty-table-with-a-list-of-variablenames#comment_311260, https://www.mathworks.com/matlabcentral/answers/244084-is-there-a-simpler-way-to-create-an-empty-table-with-a-list-of-variablenames#comment_311272, https://www.mathworks.com/matlabcentral/answers/244084-is-there-a-simpler-way-to-create-an-empty-table-with-a-list-of-variablenames#comment_758761, https://www.mathworks.com/matlabcentral/answers/244084-is-there-a-simpler-way-to-create-an-empty-table-with-a-list-of-variablenames#comment_1354864, https://www.mathworks.com/matlabcentral/answers/244084-is-there-a-simpler-way-to-create-an-empty-table-with-a-list-of-variablenames#answer_193168, https://www.mathworks.com/matlabcentral/answers/244084-is-there-a-simpler-way-to-create-an-empty-table-with-a-list-of-variablenames#comment_312159, https://www.mathworks.com/matlabcentral/answers/244084-is-there-a-simpler-way-to-create-an-empty-table-with-a-list-of-variablenames#comment_312164, https://www.mathworks.com/matlabcentral/answers/244084-is-there-a-simpler-way-to-create-an-empty-table-with-a-list-of-variablenames#comment_470739, https://www.mathworks.com/matlabcentral/answers/244084-is-there-a-simpler-way-to-create-an-empty-table-with-a-list-of-variablenames#comment_470768, https://www.mathworks.com/matlabcentral/answers/244084-is-there-a-simpler-way-to-create-an-empty-table-with-a-list-of-variablenames#comment_470913, https://www.mathworks.com/matlabcentral/answers/244084-is-there-a-simpler-way-to-create-an-empty-table-with-a-list-of-variablenames#answer_422250, https://www.mathworks.com/matlabcentral/answers/244084-is-there-a-simpler-way-to-create-an-empty-table-with-a-list-of-variablenames#comment_816386, https://www.mathworks.com/matlabcentral/answers/244084-is-there-a-simpler-way-to-create-an-empty-table-with-a-list-of-variablenames#comment_816395, https://www.mathworks.com/matlabcentral/answers/244084-is-there-a-simpler-way-to-create-an-empty-table-with-a-list-of-variablenames#comment_2409723, https://www.mathworks.com/matlabcentral/answers/244084-is-there-a-simpler-way-to-create-an-empty-table-with-a-list-of-variablenames#comment_2409828, https://www.mathworks.com/matlabcentral/answers/244084-is-there-a-simpler-way-to-create-an-empty-table-with-a-list-of-variablenames#answer_704653, https://www.mathworks.com/matlabcentral/answers/244084-is-there-a-simpler-way-to-create-an-empty-table-with-a-list-of-variablenames#comment_1532658, https://www.mathworks.com/matlabcentral/answers/244084-is-there-a-simpler-way-to-create-an-empty-table-with-a-list-of-variablenames#comment_1533173, https://www.mathworks.com/matlabcentral/answers/244084-is-there-a-simpler-way-to-create-an-empty-table-with-a-list-of-variablenames#comment_1533183, https://www.mathworks.com/matlabcentral/answers/244084-is-there-a-simpler-way-to-create-an-empty-table-with-a-list-of-variablenames#comment_1533253, https://www.mathworks.com/matlabcentral/answers/244084-is-there-a-simpler-way-to-create-an-empty-table-with-a-list-of-variablenames#comment_1561170, https://www.mathworks.com/matlabcentral/answers/244084-is-there-a-simpler-way-to-create-an-empty-table-with-a-list-of-variablenames#comment_1561615, https://www.mathworks.com/matlabcentral/answers/244084-is-there-a-simpler-way-to-create-an-empty-table-with-a-list-of-variablenames#comment_1562385, https://www.mathworks.com/matlabcentral/answers/244084-is-there-a-simpler-way-to-create-an-empty-table-with-a-list-of-variablenames#comment_1562395, https://www.mathworks.com/matlabcentral/answers/244084-is-there-a-simpler-way-to-create-an-empty-table-with-a-list-of-variablenames#comment_1562450, https://www.mathworks.com/matlabcentral/answers/244084-is-there-a-simpler-way-to-create-an-empty-table-with-a-list-of-variablenames#comment_1562525. To make an empty table, the input cell array must be empty too: Theme. Very informative answer. For example, Theme Copy optionsChange = array2table (nan (0,9)); , putting in sanity checks to detect problems early. To create an empty 0-by-5 array of class ColorInRGB, call the empty method: A = ColorInRGB.empty (0,5); Identify Empty Arrays You can use the isempty, size, and length functions to identify empty object arrays. In general, you need to do something like, You may receive emails, depending on your. are just doubles, but if you want date strings, or datetimes, you'll have to either start out with the right thing, or overwrite the doubles in the table that you want to be dates. All the answers in some form or the other require one to know a priori what you want in the table before you create the table. Add variables to an existing table by using dot notation. Assign variables to an empty table. Sighted users can visually scan a table. And then if I want to add another column, I have to remember that there are two things that need to change, otherwise Matlab will give me a runtime error. The CREATE SCHEMA statement can include CREATE TABLE, CREATE VIEW, and GRANT statements. MATLAB is full of sanity checks. Let's add the block that we created (TmpDB table). Isn't there a nicer way to do it? The problem is that "create an empty table" isn't really fully specified. If I want to make a table, I think to myself, "I want columns, ," not "I want three columns, and their names will be. your location, we recommend that you select: . Unable to complete the action because of changes made to the page. Step 3: Then use the appropriate syntax of the 'Matlab Table' function to create a table. sites are not optimized for visits from your location. Other MathWorks country Ditto for cell2table(cell(0,5)). Step 2: Assign all data to a variable. Is not empty but its not a delta table. Reload the page to see its updated state. But the original question asked about an empty table, not empty data. sites are not optimized for visits from your location. In MATLAB, you can create tables and assign data to them in several ways. your location, we recommend that you select: . Starting from this table >> optionsChange = array2table(rand(5,2)). which is why it wasn't suggested previously. sites are not optimized for visits from your location. Good solutions, everyone, but why isn't this functionality available through. sites are not optimized for visits from your location. Then you should be using a different programming language. For example. Or you can assign to a specific element of a new variable: 0.097132 0.034446 25-Sep-2015 09:02:26. Find the treasures in MATLAB Central and discover how the community can help you! Can anyone help? I keep getting numbers like -5.2018e+05 but i want them rounded to whole integers (i.e. https://la.mathworks.com/matlabcentral/answers/41186-creating-an-empty-table-matlab-gui, https://la.mathworks.com/matlabcentral/answers/41186-creating-an-empty-table-matlab-gui#answer_50756. I don't see why this: array2table(zeros(0,9), 'VariableNames',{}); It can, as long as you specify the 'Size' name-value pair as well and you're using release R2018a or later. , which defeats the purpose of a sanity check. MATLAB Commands and Functions. To make an empty table, the input cell array must be empty too: You may receive emails, depending on your. Then later on I decided to add a new column (variable). Y = fft (X) computes the discrete Fourier transform (DFT) of X using a fast Fourier transform (FFT) algorithm. Answer: To do this, the SQL CREATE TABLE syntax is: CREATE TABLE new_table AS (SELECT * FROM old_table WHERE 1=2); For example: CREATE TABLE suppliers AS (SELECT * FROM companies WHERE 1=2); This would create a new table called suppliers that included all columns from the companies table, but no data from the companies table. You may receive emails, depending on your. That's otherwise known as redundancy, and I think it's poor programming practice. Create a table from input arrays by using the table function. All the answers in some form or the other require one to know a priori what you want in the table before you create the table. Based on You can use cell2table to initialize an empty table by providing a cell array of desired dimensions. benefits of homemade chia seed pudding. And finally, as is the case with any kind of variable in MATLAB, instead of creating an empty then growing it row by row, you might consider creating a table that's the right size but filled with NaNs and empty strings or whatever. Assign variables to an empty table. You can create an empty block to stay so to avoid all N-blocks time in MATLAB create a "non-null" block. Accelerating the pace of engineering and science. Suppose, I created this table optionsChange and filled it with rows of data. Creating an empty table matlab GUI. Preallocate a table and fill in its data later. Examples of Matlab Table Here are the following examples mention below Matlab Create Empty Char Array Here's a simplified example. I don't accept the point about a "sanity check.". Accelerating the pace of engineering and science, MathWorks es el lder en el desarrollo de software de clculo matemtico para ingenieros. For example, this initializes an empty table with 0 rows and 5 variables: Now you can add data by concatenation with another table. MathWorks is the leading developer of mathematical computing software for engineers and scientists. How can you create an empty table object with named columns? Empty_table = cell2table (cell (0,2),'VariableNames', Headers) Empty_table = 0x2 empty table. apple id verification code not working. Find the treasures in MATLAB Central and discover how the community can help you! FYI the functionality you're using in your answer, the ability to specify 'Size' and 'VariableTypes' in the. Accelerating the pace of engineering and science, MathWorks leader nello sviluppo di software per il calcolo matematico per ingegneri e ricercatori, Navigazione principale in modalit Toggle. (And I suspect that tables are a poor choice for performance-critical data structures, anyway. And finally, as is the case with any kind of variable in MATLAB, instead of creating an empty then growing it row by row, you might consider creating a table that's the right size but filled with NaNs and empty strings or whatever. Based on Specifically, I'd like to be able to build a [0 x N] or [N x 0] table, so I can either add rows or columns one by one. Create a table from input arrays by using the table function. https://la.mathworks.com/matlabcentral/answers/127818-how-can-you-create-an-empty-table-object-with-named-columns, https://la.mathworks.com/matlabcentral/answers/127818-how-can-you-create-an-empty-table-object-with-named-columns#answer_592798, https://la.mathworks.com/matlabcentral/answers/127818-how-can-you-create-an-empty-table-object-with-named-columns#comment_1249808, https://la.mathworks.com/matlabcentral/answers/127818-how-can-you-create-an-empty-table-object-with-named-columns#comment_1249993, https://la.mathworks.com/matlabcentral/answers/127818-how-can-you-create-an-empty-table-object-with-named-columns#comment_1250003. sites are not optimized for visits from your location. Step 4: Then execute the code. How can you create an empty table object with. Really, the question is kind of ill-posed, because to create an empty table with a non-zero number of variables, you need to define what type each variable in a table is even if the table has zero rows. >> optionsChange.Date = datetime(zeros(0,3)); >> optionsChange.DateNM = datetime(zeros(0,3)); And finally, as is the case with any kind of variable in MATLAB, instead of creating an empty then growing it row by row, you might consider creating a table that's the right size but filled with NaNs and empty strings or whatever. For example, create an empty array of the ColorInRGB class defined in the previous section. This will keep the space you have had in the table blank in MATLAB. Accelerating the pace of engineering and science, MathWorks es el lder en el desarrollo de software de clculo matemtico para ingenieros. Step 1: Read all the data from the file. Other MathWorks country First off why cant we create an empty table with column names? Unable to complete the action because of changes made to the page. The table is create , using DELTA . Other MathWorks country Marking Up Data Tables. For example, Theme Copy optionsChange = array2table (nan (0,9)); @Nikita Agrawal: sure. Choose a web site to get translated content where available and see local events and The purpose of data tables is to present tabular information in a grid, or matrix, and to have column or rows that show the meaning of the information in the grid. Unable to complete the action because of changes made to the page. Other MathWorks country I imagine if I can have named columns in an empty table, the problem can be solved? Other MathWorks country your location, we recommend that you select: . When individual entries are non-scalar, you have to use "cell" for the type, with the exception of "char". ? ), I don't accept the point about a "sanity check." Plotting Data Using MATLAB: In this tutorial you will learn how to use the MATLAB program from MathWorks to create a script file that will make a set of data and plot that data. Choose a web site to get translated content where available and see local events and I have a loop that logically does something like this: Theme Copy a = 1 b = 2 t = [t; table (a, b)] a = 5 b = 6 t = [t; table (a, b)] However, I want to add an assert after each row creation, like this: Theme Copy a = 1 b = 2 t = [t; table (a, b)] If any statement results in an error, then the database rolls back all the statements. How can you create an empty table object with named columns? Unable to complete the action because of changes made to the page. If you're using datenums, you're fine (datenums. MATLAB is specifically designed for people who are not expert programmers: people who cannot be counted upon to only work with values that are "sane" from the point of view of the programming language. The size is easily added using length(). Add variables to an existing table by using dot notation. Line width operation mostly executes inside the plot operation. The question left unanswered is, what, of variables do you want in that table? This is often convenient when performance is not critical. You can even assign off the end, and the other variables will gro, but you will get a warning about that. To execute a CREATE SCHEMA statement, Oracle Database executes each included statement. The above all create nine double variables in the table, but your last two variable names indicate dates. I know this is an old question but I usually do the following to initialise a new empty table: % Make N by 2 matrix of fieldname + value type, % Make table using fieldnames & value types from above. -520181), Lachlan Noller: the easiest thing is to round the numbers. For example. I just don't think the particular feature of requiring a. argument when creating a table is a useful sanity check. Unable to complete the action because of changes made to the page. Really, the question is kind of ill-posed, because to create an empty table with a non-zero number of variables, you need to define what type each variable in a table is even if the table has zero rows. offers. https://it.mathworks.com/matlabcentral/answers/127818-how-can-you-create-an-empty-table-object-with-named-columns, https://it.mathworks.com/matlabcentral/answers/127818-how-can-you-create-an-empty-table-object-with-named-columns#answer_592798, https://it.mathworks.com/matlabcentral/answers/127818-how-can-you-create-an-empty-table-object-with-named-columns#comment_1249808, https://it.mathworks.com/matlabcentral/answers/127818-how-can-you-create-an-empty-table-object-with-named-columns#comment_1249993, https://it.mathworks.com/matlabcentral/answers/127818-how-can-you-create-an-empty-table-object-with-named-columns#comment_1250003. A = ColorInRGB.empty (0,5); isempty (A) Not exactly. ), BUT: based on your variable names, you may not end up what you're ultimately looking for. We will use different example codes and related outputs to clear your concepts and give you a complete insight using MATLAB. That may or may not be useful or even possible in your case, just a suggestion. Based on People who do not use good programming practices themselves. For example, this adds a row of data to the table created above: Thanks for the suggestion, Jacob! I would like to create an empty table with the headers 'Observations', 'Mean', 'Treatment' and 'Residual'. Andrei, Walter's solution works, as would, optionsChange.Properties.VariableNames = {, (Both of those have the advantage that they create 0x1 variables in the table, rather than 0x0, and so if you subsequently do something like, Exp Strike Put_Mark Put_Ask Put_Bid Put_Delta Put_ImplVol Date DateNM, 0 0 0 0 0 0 0 0 0, 2 0 0 0 0 0 0 0 0, everything will grow in the vertical direction. Thanks for the addition! However I created a variable A = ones (3,1) and chose the data on the table to reflect this variable, thus the table size changed to a 3x1 (which is what I would like it to be). Find the treasures in MATLAB Central and discover how the community can help you! I agree with Ilya Gurin, it would be much easier to be able to initialise tables with this syntax: which i would expect to return an empty table with named variables. Reload the page to see its updated state. Based on Accepted Answer: Tom The default size of a table on matlab appears to be a 4x2. The point is, do I always have to count the number of rows and create a new column with the same number of rows? You can get that height from the table you're assigning into: >> optionsChange.Date = NaT(height(optionsChange),1). . But the original question asked about an empty table, not empty data. I would also like the predetermine the amount of data to fit in the table, i.e., if I have two 2 sets, the table should allow for 2*4 inputs. I think this is quite readable and allows you to add value types. It's kind of like saying, "create an empty variable". A = ColorInRGB.empty (0,5); isempty (A) Introduction to Matlab zeros () The Matlab inbuilt method zeros () creates array containing all element as zero or empty value. ." That form requires you to redundantly enter the size information, which is already implied by the variable names. Setting Axis Limits :: Axes Properties . you can add a new variable, but it has to be the correct height. >> optionsChange = array2table(zeros(0,9). Perhaps just set your command window to use the longg format. Then convert to a table and edit the VariableNames property to make it the headers: data = cell (4,5); T = cell2table (data); T.Properties.VariableNames = headers Output: Remove xticks but keep xticklabels in MATLAB . The problem is that now the table is filled with 1's and I would like the table to be empty at the start of the GUI. offers. See. For example, I have a sequence [2,3,6,8,9,10,12,14,16,17]. However I created a variable A = ones (3,1) and chose the data on the table to reflect this variable, thus the table size changed to a 3x1 (which is what I would like it to be). This is possible with other native arrays, but I can't work out how to do it with a table. so for sure is a . Accelerating the pace of engineering and science. The default size of a table on matlab appears to be a 4x2. They can quickly make visual associations between data in the table and their appropriate row and/or column headers. MATLAB's goal of efficiency is secondary to MATLAB's goal to make the software accessible to users who are to be expected to make a lot of mistakes. Headers = {'A','B'} Headers = 1x2 cell array. I have a loop that logically does something like this: However, I want to add an assert after each row creation, like this: But since t starts off empty, before I run t{:,{'a'}} I have to check if t is empty. Thanks, Peter. When I want to create a chararray with the code below the text will wrap up as it should, instead of inserting it into the text browser, I need it to be inserted into the DOM window. is implied by the variable names. creates an empty table with five variables, but all five are doubles, which may or may not be what you want. (By the way, it occurred to me that using the NaT function is a simpler way to preallocate a datetime than something like datetime(zeros(0,3))). 5, and store their indices in a vector called i: i = find (x<. If I do this like, Lets assume I didn't create the Date column from the beginning: optionsChange.Date = datetime(zeros(0,3)); To assign to or create a variable in a table. Find the treasures in MATLAB Central and discover how the community can help you! You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. But the original question asked about an empty table, not empty data. Point taken about the number of rows. You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. Learn more about matlab tables I have a loop that logically does something like this: a = 1 b = 2 t = [t; table(a, b)] a = 5 b = 6 t = [t; t. 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