(0-by-0) structure. Does integrating PDOS give total charge of a system? The cell arrays for value2 and value3 are 1-by-2, so s is also 1-by-2. Field name, specified as a character vector or string scalar. You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. all elements of s. For example, s = Reload the page to see its updated state. described below. How to set a newcommand to be incompressible by justification? At what point in the prequels is it revealed that Palpatine is Darth Sidious? % MATLAB "cell arrays" allow character strings of various lengths % to be stored in the same array. Notice that I have used a transpose in the middle and the end of the expression so that it works with the arrangement you mentioned in your question and gives you a column vector as a result. An array of structures is sometimes referred to as a struct array. now matches the previous behavior of assigning a structure, which is consistent with 'c'. value input instead. There are 2 ways to define a structure in MATLAB (i.e. If S is 0-by-5 or 5-by-0, then For example, instead of defining the field size in the matrix structure, we could define another structure that we would call info with the field size and numberOfElements: matrix.info would then be a nested structure of the data type struct:The issue with nested structure is that you dont see them by typing the upper-level structure name; instead, you only see the current layer of the level of the structure typed into your workspace: You cant see the fields of the structure in the info field of the matrix structure. Find the treasures in MATLAB Central and discover how the community can help you! For example, if you want to access the second element of the blockList structure array defined above, use: You can then access any field of this element: In MATLAB, if you want to convert a structure to a matrix, you have to use a workaround. S(3)=struct('a',2) and S(3).a=2 I have a 1x300 struct object. S(5)=struct('a',7,'b',[]) and How do I tell if this single climbing rope is still safe for use? A structure array is a data type that groups the related data using the data containers called fields. Create a structure with a field that contains a cell array. I want to assign the cell array to a new field in the struct, but am getting "Scalar structure required for this assignment." . If you need access to a new variable that is outside that function, you can define that variable as a new field in an existing structure argument of that function. You clicked a link that corresponds to this MATLAB command: Run the command by entering it in the MATLAB Command Window. I assume NM is your 300 element structure array. dimensions. If the value argument is a cell array, How might I go about accessing all the data(j,1) doubles to compute a mean? Other MathWorks country nonscalar cell array inputs must have the same dimensions. Currently I am developing a NMPC controller and the functions used for the algorithm (state definition, cost, etc.) Based on For array. Previously, S(5).a=7 resulted in a 1-by-5 To specify an empty field and keep the Previously, the output dimensions were different when you value input argument can be any data type, such as a empty (0-by-0) structure. How might I go about accessing all the data(j,1) doubles to compute a mean? = 'a', s(2).x = 'b', When you access a field of a nonscalar structure, such as s.f, MATLAB returns a comma-separated list. You can specify many fields simultaneously, or create a nonscalar Ready to optimize your JavaScript with Rust? 7 Answers Sorted by: 80 Using repmat is by far the most efficient way to preallocate structs : N = 10000; b = repmat (struct ('x',1), N, 1 ); This is ~10x faster using Matlab 2011a than preallocating via indexing, as in N = 10000; b (N).x = 1 The indexing method is only marginally faster than not preallocating. So, the first thing to do is to convert your 2d cell array of 1d vectors into a 3d matrix. I would like to take a mean of the values in the double arrays row by row. Find centralized, trusted content and collaborate around the technologies you use most. structName.fieldName. Create a nested structure, where a is a structure with a field that contains another structure. This way of thinking is a lot more intuitive than considering all the variables youve defined as equal.. general array expansion. Connecting three parallel LED strips to the same power supply. If value is a nonscalar cell array, then Using the struct2cell MATLAB command you can convert the structure mStructure into a vector of cells, which you can convert into a matrix using the command cell2mat: Then, using the reshape MATLAB command as the following: But, if you want your matrix organized in such a way that the first fields of your structure appear on the first row instead of the first column (i.e. The struct function copies the properties of This syntax is valid for MATLAB versions R2018b and later. Lets see how to do that by defining a structure with 4 fields: Lets say that you want the following 22 matrix: \(\begin{pmatrix}1 & 3\\2 & 4\end{pmatrix}\). 1-by-1-by-5. The offers. Mean = Example: by how Matlab handles struct arrays. Other MathWorks country sites are not optimized for visits from your location. The final result depends on how you arrange the data, that is, if the data structure is a row vector or a column vector, and if the data inside each element of the data structure is a column vector or a row vector. s = struct('a',[1 2 3]) creates a 1-by-1 As others have said, using a cell array for storing matrices all the same size is a waste as it makes manipulation harder. Other MathWorks country private, protected, and hidden properties become public fields in I assume NM is your 300 element structure array. Asking for help, clarification, or responding to other answers. If value is not a cell Plot the sine wave. On a more pragmatic note, structures promote the maintainability of your code. your location, we recommend that you select: . Unable to complete the action because of changes made to the page. Now, if A is a Matrix form, then mean (A) returns a row vector containing the mean of every column. struct('a',2) andS(3).a=2 produce errors Based on your location, we recommend that you select: . Answers (2) nmfinal=mean (cell2mat (squeeze (struct2cell (nm.data))'))'; You might need to take some precautions though. You can refer to the arrays of x- and y-values by their field names. structure array. MathWorks est le leader mondial des logiciels de calcul mathmatique pour les ingnieurs et les scientifiques. However, Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Create an empty structure that contains several fields. Likewise, if I try to use something like, I get the error "Scalar index required for this type of multi-level indexing.". I am thinking this is simple though. For code generation, when you create an array of MATLAB structures, corresponding fields in the array elements must have the same size, type, and complexity.. Once you have created the array of structures, you can make the structure fields variable-size by using coder.varsize (MATLAB Coder). If S is 1-by-1-by-3 with two fields, then Choose a web site to get translated content where available and see local events and offers. I know it can sound erudite or impractical to think about that while coding. names = {'Steven' 'Matt' 'Giovanni' 'Ashanti' 'Meagan' 'Gabriela' 'Peggy'} value input is a nonscalar cell array, then all s = struct(obj) creates a scalar A structure array is a data type that groups related data Connect and share knowledge within a single location that is structured and easy to search. The final result depends on how you arrange the data, that is, if the data structure is a row vector or a column vector, and if the data inside each element of the data structure is a column vector or a row vector. value. You also can create a structure array using the struct function, Not the answer you're looking for? Appropriate translation of "puer territus pedes nudos aspicit"? We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. Multidimensional arrays in MATLAB are an extension of the normal two-dimensional matrix. array, or if value is a scalar cell array, then For example: If you click on a Simulink block and run the command above, youll get the list of all the fields of a Simulink block structure. array, then s has the same dimensions as that S(5,2)=struct('a',3) and Create a structure that contains an empty field. You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. if all value inputs that are cell arrays are s. The struct function issues a Find the treasures in MATLAB Central and discover how the community can help you! 3. Disconnect vertical tab connector from PCB. For example, if after the name of a variable: To access an element in a structure array: % returns the name of the fields of the structure, % 1 if the argument is a structure, 0 otherwise, MATLAB Data Structures: Basic Syntax, Accessing Elements and Structure Array, Start Your First Python Project in 3 Steps, https://www.mathworks.com/MATLABcentral/fileexchange/35156-display-data-structure-for-nested-struct, Xlsread Tutorial: Extract Data from Excel in MATLAB, Round MATLAB Function: Floor, Ceil, Fix and Round. Each element of the struct is a 3453x1 double array. Generally speaking, the fewer input/output arguments in a function the better. For completeness sake, an explicit loop version: Since the fields of all the structs in the array have the same size, you can perform this computation very easily as follows: The variable m is then a row vector of double values in which each row contains the mean of the respective condition: Thanks for contributing an answer to Stack Overflow! creates a structure array with the specified field and value. A structure array is a data type that groups related data using data containers called fields. Use MATLAB commands to manipulate structures, The value field of the matrix structure (matrix.value) is, % acess the second element of the block list. Accelerating the pace of engineering and science. S was 5-by-0. I mean, do you really have time for such minutia? Creation When you have data to put into a new structure, create the structure using dot notation to name its fields one at a time: for the list of fundamental data types. S(5,2).a=3 both expand S to Then add the title. scalars, then s is a scalar structure. The final result depends on how you arrange the data, that is, if the data structure is a row vector or a column vector, and if the data inside each element of the data structure is a column vector or a row vector. Do you want to open this example with your edits? Because you have a structure array, you'll need to use an explicit loop or an implicit arrayfun loop. s = struct(field,value) S(3).a=1 resulted in a 1-by-5 array when M = mean (A,vecdim) computes the mean based on the dimensions specified in the vector vecdim. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Choose a web site to get translated content where available and see local events and What are the criteria for a protest to be a strong incentivizing factor for policy change in China? Doing the opposite would be a violation of the DRY (Dont Repeat Yourself) principle since you somewhat repeat the shared meaning in every separate variable. But, this would be disregarding the number of times you need to go back at your code to tweak and debug it. I would like to take a mean of the values in the double arrays row by row. Accelerating the pace of engineering and science. Lets say that you want to define an array of Simulink blocks: Another way would be to define an empty vector and to concatenate every element to the rest of the array as you go: Although identical, I personally tend to use the second option much more frequently in a for loop and the first option as a way of initializing a structure. new structure. Similarly, because the cell array for value4 has a single element, s(1).f4 and s(2).f4 have the same contents. : Grab Your Free Online Course Right Now! nonscalar cell arrays, then they all must have the same MathWorks is the leading developer of mathematical computing software for engineers and scientists. char data type, then Each field can contain any type of data. Admittedly, placing it in the toolshed takes more time than throwing it on the floor, but doing so will save you time when you need to locate a certain portion. cell array. For example: If S is 1-by-2-by-3-by-4, then For instance, offers. It's up to you how you map the cell array / vector dimensions to the matrix dimensions. nmfinal=mean (cell2mat (squeeze (struct2cell (nm.data))'))'; You might need to take some precautions though. s = struct(field1,value1,,fieldN,valueN) creates a Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content, How to extract columns of data from .txt files MATLAB, Find the indices of false values in array and display them in an error, Is there a way to calculate an asymmetrical mean (e. g. from percentile 0.05 to 0.5) by group using the aggregate command? Access data in a field using dot notation of the form So basically, something like this (I know this code doesn't work): This throws up the error "Field reference for multiple structure elements that is followed by more reference blocks is an error." Value to the structure can be added using a structure name and filedname connected with the dot operator. from most of the fundamental data types. Taking the mean of rows in a structure array. %% This is an example of how to create a cell array. Store related pieces of data in the fields of a structure. s is a structure array with the same Starting in R2019a, the dimensions of an expanded structure array are consistent Thus, we get: This is because the field named value exists in the matrix structure. Unable to complete the action because of changes made to the page. the contents of value in the relevant field for no fields. Learn more about struct, accessing struct, struct indexing Hi everyone, I am stumped on this and am guessing that someone might know an easy way to do this, so thanks in advance for any help you might be able to offer. For example, let's create a two-dimensional array a. This is certainly the case with older versions of MATLAB, but engine improvements have started to bring parity to their performance. notation to name its fields one at a time: Field names can contain ASCII letters (AZ, az), digits (09), and underscores, and I am stumped on this and am guessing that someone might know an easy way to do this, so thanks in advance for any help you might be able to offer. When a structure is used as an argument in a function, you get access to the different fields of the structure from within that function. This structure does not retain the class information, so 'a' and s(2).x = 'b'. Web browsers do not support MATLAB commands. Making statements based on opinion; back them up with references or personal experience. When coding in MATLAB, your functions must be organized and well-written. How does the Chameleon's Arcane/Divine focus interact with magic item crafting? struct does return the properties of a table or Assigning to a field using dot notation S(5)=struct('a',7,'b',[]) and Previously, S(5).a=7 resulted in a 1-by-5 array. In MATLAB, mean (A) returns the mean of the components of A along the first array dimension whose size doesn't equal to 1. As an example of the latter: condition (1).subject1 = 1:10; condition (1).subject2 = 1:20; condition (2).subject1 = 1:30; condition (2).subject2 = 1:40; results = arrayfun (@ (x)mean (structfun (@mean, x)), condition).'; Which gives us: timetable as a structure. If S is 0-by-1 with two fields, then Accelerating the pace of engineering and science. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Reload the page to see its updated state. You have a modified version of this example. structure to the array. s contains the corresponding element of It can be one dimensional or multi-dimensional. https://fr.mathworks.com/matlabcentral/answers/140659-taking-the-mean-of-rows-in-a-structure-array, https://fr.mathworks.com/matlabcentral/answers/140659-taking-the-mean-of-rows-in-a-structure-array#answer_143987, https://fr.mathworks.com/matlabcentral/answers/140659-taking-the-mean-of-rows-in-a-structure-array#comment_224322, https://fr.mathworks.com/matlabcentral/answers/140659-taking-the-mean-of-rows-in-a-structure-array#answer_143997. Create a structure by adding fields to it using dot notation. Access data in a field using dot notation of the form structName.fieldName. Based on with NM(k).data holding the 3453 data points of the kith element of the structure, nmfinal = arrayfun(@(k) mean(NM(k).data), 1:numel(NM)), You may receive emails, depending on your. Books that explain fundamental chess concepts. % Note that cell arrays use squiggly brackets { }, instead of % the square brackets [ ], used by numerical arrays. 'my_double' are different struct issues an error message. Define Arrays of Structures for Code Generation Ensuring Consistency of Fields. For example, if A is a matrix, then mean (A,2) is a column vector containing the mean of each row. Suppose that A is a vector, then mean (A) returns the mean of the components. {}, then the output is an empty structure array. A struct can have a single field, many fields, and even no field. In this example, the more nested the function is, the more useful that structure becomes. Each element of the struct is a 3453x1 double array. The struct function does not create a structure If value is an empty cell array Live Demo isfield | table | isstruct | fieldnames | orderfields | rmfield | substruct | cell2struct | struct2cell | struct2table | table2struct | namelengthmax. Values, specified as any type of array. Sometimes, you wont know what the fields of a structure are, so youll want to use the MATLAB command fieldnames to figure them out: The fieldnames command returns a cell array containing the name of the fields of the structure. with NM(k).data holding the 3453 data points of the kith element of the structure, nmfinal = arrayfun(@(k) mean(NM(k).data), 1:numel(NM)), You may receive emails, depending on your. a MATLAB struct). If any of the value inputs is a nonscalar cell The fields contain x- and y-values for a sine wave, and text that describes the data. However, the terms struct array and structure array mean the same thing. dimensions as value. sites are not optimized for visits from your location. While structfun allows you to perform an operation over the fields of a structure, it only works with scalar arrays. This is because the second way uncouples the loop iteration variable from the index of the array (there is no i in the second way). If any value input is an empty cell array, obj to the fields of a new scalar did not specify indices for all dimensions. 1980s short story - disease of self absorption. For example, s = R-STUDIO, Computing mean of Python numeric vector in MATLAB. MathWorks is the leading developer of mathematical computing software for engineers and scientists. nmfinal=mean (cell2mat (squeeze (struct2cell (nm.data))'))'; You might need to take some precautions though. If none of the value inputs are cell arrays, or obj. Previously, B = {'apple', 'banana', 'banana'; 'cherry', 'cherry', 'apple'}; See the second and third items . listOfWordStructures would then look like the following: Accessing an element in a structure array is essentially the same as accessing an element in a regular array. structure with field names and values that correspond to properties of You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. To specify a single empty field, use []. Specifically, well tackle the following: Using structures forces you to see variables as subcategories of other variables. One option: all elements must have the same Previously, https://www.mathworks.com/matlabcentral/answers/140659-taking-the-mean-of-rows-in-a-structure-array, https://www.mathworks.com/matlabcentral/answers/140659-taking-the-mean-of-rows-in-a-structure-array#answer_143987, https://www.mathworks.com/matlabcentral/answers/140659-taking-the-mean-of-rows-in-a-structure-array#comment_224322, https://www.mathworks.com/matlabcentral/answers/140659-taking-the-mean-of-rows-in-a-structure-array#answer_143997. Previously, S(5,2).a=3 resulted in a Is it cheating if the proctor gives a student the answer key by mistake and the student doesn't report it? values of the other fields, use [] as a In this example, the field names are value and size:This command is particularly useful when you want to know the field of a Simulink block. Each field can contain any If you use a structure to put them together, you only need to probe into one variable. I guess I can resort to looping through the struct but was hoping there might be an easier way nmfinal=mean(cell2mat(squeeze(struct2cell(nm.data))'))'; You might need to take some precautions though. Another simple and useful MATLAB command is the isstruct command, which returns the Boolean value 1 if its argument is a structure and 0 otherwise: As we saw already, we can define a nested structure by defining a structure in the field of another structure. using data containers called fields. more information, see Run MATLAB Functions in Thread-Based Environment. structure. Create a nonscalar structure that contains a single field. If any value input is an empty cell array, Struct array field names must have the same length. Appealing a verdict due to the lawyers being incompetent and or failing to follow instructions? convert obj, but rather creates s as a Learn more about scalar structure MATLAB I have a 1 x 50 cell array I have a 50 x 1 struct with 8 fields. So basically, something like this (I know this code doesn't work): This throws up the error "Field reference for multiple structure elements that is followed by more reference blocks is an error." S(3).a=2 resulted in a 1-by-6 array. Did neanderthals need vitamin C from the diet? 5-by-2-by-3-by-4. Lets say you want to define a structure named block (representing a Simulink block) with 2 fields: In both examples, weve defined the same MATLAB struct:Lets break it down: Defining an array in a structure comes down to considering the field as a regular variable: Now that you can define a structure, you need to know how to access an element within a structure. code errors because 'my_int' and Each element of the struct will contain the data from the corresponding cell of the cell array. Using a dot (.) {}, then output s is an I have a 1x300 struct object. structure, where s.a = [1 2 3]. M = mean(X, vecdim) This function will calculate the mean on the basis of the dimensions specified in the vecdim vector. Incidentally, using structures could be a way of circumventing the issue of lists of strings where each character is considered to be an element of a matrix. {}, then s is an empty The command isfield returns the Boolean value 1 if the field has been defined in the structure and 0 if its not. whether you assign a value to a single field using dot notation or assign an entire obj has the double or array of any other data type, struct inserts As a native speaker why is this usage of I've so awkward? A structure array has the following properties: All structures in the array have the same number of fields. s = struct creates a scalar (1-by-1) structure with The final result depends on how you arrange the data, that is, if the data structure is a row vector or a column vector, and if the data inside each element of the data structure is a column vector or a row vector. struct('x',{'a','b'}) returns s(1).x = The keyword used for a structure in Matlab is "struct" Array of a structure is also possible in Matlab. When you have data to put into a new structure, create the structure using dot Generally to generate a multidimensional array, we first create a two-dimensional array and extend it. s(1).y = 'c', and s(2).y = Because value1 is a numeric array and not a cell array, both s(1).f1 and s(2).f1 have the same contents. For example, this In this case, s.f is equivalent to s(1).f, s(2).f, s(3).f. structure array with multiple fields. I would like to calculate the mean for each condition, so for each LINE of the struture. must begin with a letter. which I have spent a good deal of time Googling but am not really finding an example similar enough to mine to be really useful. s = struct([]) creates an empty (0-by-0) structure To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Although having well-written functions can seem somewhat subjective, there are objective criteria to assess how well-written a function is. All Rights Reserved. make use or a broad array of parameters. warning when you use this syntax. I guess I can resort to looping through the struct but was hoping there might be an easier way nmfinal=mean(cell2mat(squeeze(struct2cell(nm.data))'))'; You might need to take some precautions though. To do that, you can use the MATLAB command isfield: The first argument of this command is the structure, and the second is the field. Generate C and C++ code using MATLAB Coder. S was 0-by-5 and in a 3-by-1 array when Each field can contain any type of data. struct('x',{'a','b'},'y','c') returns s(1).x your location, we recommend that you select: . Each element of If any with no fields. S(5).a=7 both expand S to 5-by-1. Choose a web site to get translated content where available and see local events and A more efficient method is to pull all of the eccentricities from the struct array using the fact that ecc.Eccentricity is itself a comma-separated list of values: Eccentricities = [ecc.Eccentricity]; This is just like [ecc (1).Eccentricity, ecc (2).Eccentricity,.] Use [] to specify the value of the empty field. For eg. s is a scalar structure. namelengthmax. which I have spent a good deal of time Googling but am not really finding an example similar enough to mine to be really useful. sites are not optimized for visits from your location. rev2022.12.9.43105. See Fundamental MATLAB Classes You can give the fields human-readable names that describe the data. Create a nonscalar structure that contains several fields. In this article, well see why structures (or MATLAB struct) can help meet some of these criteria and how to use them. The final result depends on how you arrange the data, that is, if the data structure is a row vector or a column vector, and if the data inside each element of the data structure is a column vector or a row vector. Learn more about scalar structure MATLAB I have a 1 x 50 cell array I have a 50 x 1 struct with 8 fields. When defining a structure based on a conditional statement you may need to query for the existence of a specific field in this structure. Because you have a structure array, you'll need to use an explicit loop or an implicit arrayfun loop. Therefore, storing a list of words that dont have the same number of letters wouldnt work. Notice that I have used a transpose in the middle and the end of the expression so that it works with the arrangement you mentioned in your question and gives you a column vector as a result. Again, doing this is possible when considering the field as a regular variable: So, if you want to access an element of the matrix.value variable, for example, you can do that by considering matrix.value as a regular matrix: Which would access the element of the 1st row and 2nd column of the matrix.value matrix: Weve seen how to define an array in a structure, but youll often need to define an array of structure (matrix or vector). By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Also, if two or more value inputs are To display every level of the structure, you can use the function datastructure (see here:https://www.mathworks.com/MATLABcentral/fileexchange/35156-display-data-structure-for-nested-struct)Then, you can use as the following: This will create a text file (called test.txt in this example) where the nested structures are detailed: If you want to learn more about the tools that helped me stop wasting time doing mindless work (such as generating Excel reports, Word documents, or creating clean and simple user interfaces) I wrote a small reference book about it: 2022 realtechnologytools.com. type. : Trying to find a variable in a piece of code without structures would be like having all your household supplies on the floor and trying to find a screwdriver. S(5).a=7 both expand S to Can virent/viret mean "green" in an adjectival sense? I want to assign the cell array to a new field in the struct, but am getting "Scalar structure required for this assignment." . To learn more, see our tips on writing great answers. because it is ambiguous which dimension to expand. Structure Array in Matlab Programming An array of structures is generally referred to as a struct array. If a set of variables that describe the attributes of the same item is used separately in your code, the meaning of every variable needs to be separately investigated. both expand S to 1-by-3. Assign a value to a field in an empty structure. I want to assign the cell array to a new field in the struct, but am getting "Scalar structure required for this assignment." I am not finding the right documentation to answer the question. If the field values you pass into the struct function are a cell array, MATLAB will make a struct array the same size as the cell array. The maximum length of a field name is Accepted Answer. I am stumped on this and am guessing that someone might know an easy way to do this, so thanks in advance for any help you might be able to offer. M = mean (A,dim) returns the mean along dimension dim. How many transistors at minimum do you need to build a general-purpose computer? Structure array expansion is consistent with general array expansion, Store Related Data Variables in Structure, s = struct(field1,value1,,fieldN,valueN), Run MATLAB Functions in Thread-Based Environment. Likewise, if I try to use something like, I get the error "Scalar index required for this type of multi-level indexing.". In Matlab I have used a structure to pass the parameters without problem, e.g. Depending on MATLAB version, the *fun functions may be slower than the explicit loop due to additional function call overhead. Define a structure in MATLAB Manipulate MATLAB struct arrays Convert a structure to a matrix Use MATLAB commands to manipulate structures Improve Your Code by Using Structures Improving Your Architecture Using structures forces you to see variables as subcategories of other variables. Like other arrays in MATLAB, a struct array can have any dimensions. lengths: This function fully supports thread-based environments. you want this matrix): \(\begin{pmatrix}1 & 2\\3 & 4\end{pmatrix}\). Like other MATLAB arrays, a structure array can have any dimensions. An array having more than two dimensions is called a multidimensional array in MATLAB. If S is 0-by-2-by-3, then S(3) = The struct function does not type of data. For any value that is a scalar cell array or an if we have a matrix, then the mean(X,[1 2]) will be the mean of all the elements present in A, because every element of the matrix A will be contained in the slice of the array defined by the dimensions 1 & 2 (As already mentioned, please do Remember that . 5-by-24 array. numeric, logical, character, or cell array. 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