We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. Find centralized, trusted content and collaborate around the technologies you use most. If I use cell2mat on each row separately, I receive one matrix as double and one as int32. Not the answer you're looking for? Link. m = cell2mat(c) Why does my stock Samsung Galaxy phone/tablet lack some features compared to other Samsung Galaxy models? Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content. Choose a web site to get translated content where available and see local events and Unable to complete the action because of changes made to the page. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. cellfun cellfun for matlab cell2mat y=cell2mat(c) yx. This function fully supports thread-based environments. Input cell array, in which all cells contain the same data type. - I was thinking that perhaps I could stay on a single vector of uint8s from the start (without placing separate lines into cells) and then somehow inject uint8(0) in places after the end of shorter lines but I could not see a fast(er) way to do it other than copying across to another empty matrix of uint8s. Ready to optimize your JavaScript with Rust? Can we keep alcoholic beverages indefinitely? The cell arrays are huge, could be holding hundreds of millions of uint8 vectors and even checking the maximum length with cellfun(@numel,c) is very costly. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. Is there a higher analog of "category with all same side inverses is a groupoid"? Convert Cell Array of Structures to Array, Run MATLAB Functions in Thread-Based Environment, Run MATLAB Functions with Distributed Arrays. Why is the federal judiciary of the United States divided into circuits? The elements of the cell array must all contain the same data type, and the resulting array is of that data type. i2c_arm bus initialization and device-tree overlay. How does legislative oversight work in Switzerland when there is technically no "opposition" in parliament? Is it correct to say "The glue on the back of the sticker is dying down so I can not stick the sticker to the wall"? 1 Asking for help, clarification, or responding to other answers. Making statements based on opinion; back them up with references or personal experience. There are >50 rows. Find the treasures in MATLAB Central and discover how the community can help you! information, see Run MATLAB Functions with Distributed Arrays (Parallel Computing Toolbox). It matters if you want the row or column order. into an N-dimensional rectangle. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. To learn more, see our tips on writing great answers. mat2cell | num2cell | cell | cell2table | cell2struct | struct2cell | table2cell | iscell. of rows (see figure). So please post a small example of the input data and the wanted output. PSE Advent Calendar 2022 (Day 11): The other side of Christmas. Thanks! Where does the idea of selling dragon parts come from? The example shown below combines matrices in a 3-by-2 cell array into a single 60-by-50 matrix: The dimensionality (or number of dimensions) of m will match the highest dimensionality contained in the cell array. Connect and share knowledge within a single location that is structured and easy to search. '14a' Each cell array must have the same dimensions. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Asking for help, clarification, or responding to other answers. Does integrating PDOS give total charge of a system? How were sailing warships maneuvered in battle -- who coordinated the actions of all the sailors? How can I use a VPN to access a Russian website that is banned in the EU? I wasn't aware of this.. E.g., matrix_c=reshape([padded_c{:}],[],numel(c)). To learn more, see our tips on writing great answers. {1N logical} , cell2mat . The other method you mention is using cell2mat( ), but this puts the data in rows: Since matrices are stored in column-order in MATLAB, note that the first method above has better memory access patterns since the original row data is kept contiguous in memory in the final columns. You may receive emails, depending on your. The cell arrays are huge, could be holding hundreds of millions of uint8 vectors and even checking the maximum length with cellfun(@numel,c) is very costly. '@7@' I have a similar question I already found being asked but I need very fast solution that specifically converts cellarray of vriable length uint8 vectors into a matrix of uint8s with 0s padded to the end of shorter vectors. What is the best way to replace an empty element in matrix with -1? Based on Examples of frauds discovered because someone tried to mimic a random sequence. but if I need to convert back to uint8 via y=uint8(char(y)), the the above function that operates on uint8 only (without the need to expand to char or string) is the fastest. Japanese girlfriend visiting me in Canada - questions at border control? ismissing missing . If your cells could still contain zero values (not just [] ), you could replace the empty cells with 0 by first using the function cellfun to find an index for the empty cells: emptyIndex = cellfun ('isempty', mycellarray); % Find indices of empty cells mycellarray (emptyIndex) = {0}; % Fill empty cells with 0 mylogicalarray = logical (cell2mat . '36@' How could my characters be tricked into thinking they are on Mars? Convert cell array to ordinary array of the underlying Any ideas? The contents of C must support concatenation into an N-dimensional rectangle. Otherwise, the results are undefined. Combine the matrices in four cells of cell array C into the single matrix, M. Based on your location, we recommend that you select: . What I want is the similarly performing function but on cellarrays of uint8s that occupy half of the space compared to chars. cell2mat. m = cell2mat(c) Description. Extracting data from struct within matlab table. Choose a web site to get translated content where available and see local events and offers. converts a multidimensional cell array, c, with contents of the same data type into a single matrix, m. The contents of c must be able to concatenate into a hyperrectangle. Syntax. '@8@'. https://www.mathworks.com/matlabcentral/answers/1824393-fast-cell2mat-with-padding-or-numerical-equivalent-of-pad-function-that-works-very-fast-on-cellarray, https://www.mathworks.com/matlabcentral/answers/1824393-fast-cell2mat-with-padding-or-numerical-equivalent-of-pad-function-that-works-very-fast-on-cellarray#comment_2410708, https://www.mathworks.com/matlabcentral/answers/1824393-fast-cell2mat-with-padding-or-numerical-equivalent-of-pad-function-that-works-very-fast-on-cellarray#comment_2411128, https://www.mathworks.com/matlabcentral/answers/1824393-fast-cell2mat-with-padding-or-numerical-equivalent-of-pad-function-that-works-very-fast-on-cellarray#comment_2411793. Are you open to creating a mex routine? Other MathWorks country That last option is what you see here. How do I detect empty cells in a cell array? The input argument func is a function handle to a function that takes one input argument and returns a . The elements of the cell array cell2mat The elements of the cell array must all contain the same data type, and the resulting array is of that data type. For example, the contents of cells in the same column must have the One would have to examine all the cell element headers to get the maximum length vector first (the equivalent of max(cellfun(@numel,c))), then create and fill the matrix. and then convert it really fast to a matrix by: matrix_c=reshape([padded_c{:}],[],numel(c)); which is btw a way faster than cell2mat I could have used. A = cell2mat(C) converts MathWorks is the leading developer of mathematical computing software for engineers and scientists. You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. MathWorks ist der fhrende Entwickler von Software fr mathematische Berechnungen fr Ingenieure und Wissenschaftler. . For more Ready to optimize your JavaScript with Rust? Why would Henry want to close the breach? What I want is the similarly performing function but on cellarrays of uint8s that occupy half of the space compared to chars. A = cellfun ('isclass', C, classname) returns logical 1 ( true) for each element of C that matches the classname argument. Do non-Segwit nodes reject Segwit transactions with invalid signature? '25b' Accelerating the pace of engineering and science. Or convert all values to doubles before calling cell2mat using cellfun. Why does the distance from light to subject affect exposure (inverse square law) while from subject to lens does not? {1N logical} . Not the answer you're looking for? This will be the best for memory access purposes. cellfun then concatenates the outputs from func into the output array A, so that for the i th element of C, A (i) = func (C {i}). Sie haben auf einen Link geklickt, der diesem MATLAB-Befehl entspricht: Fhren Sie den Befehl durch Eingabe in das MATLAB-Befehlsfenster aus. The corresponding function in Mathematica would be . Find centralized, trusted content and collaborate around the technologies you use most. more information, see Run MATLAB Functions in Thread-Based Environment. I have an array of empty cells and ones that I want to convert to a logical array, where the empty cells are zeros. Why do some airports shuffle connecting passengers through security again. Other MathWorks country sites are not optimized for visits from your location. Is that what you want? We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. Is there a way to perform this operation without using loops? Thread-Based Environment Run code in the background using MATLAB backgroundPool or accelerate code with Parallel Computing Toolbox ThreadPool. accepts numeric, logical, or character data within cells of C, or Otherwise, the results are undefined. Moreover, for each pair of neighboring cells, the dimensions of the cell's contents must match, excluding the dimension in which the cells are neighbors. I need it for DNA sequences analysis. a cell array into an ordinary array. If you know your cell array is only going to contain ones and [] (which represent your zeroes), you can just use the function cellfun to get a logical index of the empty cells, then negate the index vector: If your cells could still contain zero values (not just []), you could replace the empty cells with 0 by first using the function cellfun to find an index for the empty cells: Thanks for contributing an answer to Stack Overflow! For cell2mat does The input is typically a text with lines of only a few characters arranged in sequences of up to 160 or so. Is it appropriate to ignore emails from a student asking obvious questions? How do I arrange multiple quotations (each with multiple lines) vertically (with a line through the center) so that they're side-by-side? - Cris Luengo. For You can use cellfun to cast all data to doubles before using cell2mat: Thanks for contributing an answer to Stack Overflow! To subscribe to this RSS feed, copy and paste this URL into your RSS reader. A = cell2mat (C) converts a cell array into an ordinary array. This would involve only one pass through the data and would not require any intermediate variables. Reload the page to see its updated state. The contents of C must support concatenation which results in [1,1,1,1], not [1,0,1,1,1]. Delete elements within cells of array MATLAB, Concatenate subcells through one dimension of a cell array without using loops in MATLAB, Moving rows from a matrix to a cell array using matlab: Trouble indexing cells, Matlab remove empty cells from within cell array, How to combine matrix of different size in a cell array into a matrix in MATLAB, Return the cells in a cell array that don't contain all zeros in matlab, Change empty matrices to zero matrices of the same dimensions in matlab. A = cell2mat(C) converts a cell array into an ordinary array. rev2022.12.11.43106. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Each cell array must have the same dimensions. When I import data from a database, I receive it as a cell. with an anonymous function. structures with the same field names and data types. MATLAB. Extract data from cell array and include index of cell for identification. Moreover, for each pair of neighboring cells, the dimensions of the cell's contents must match, excluding the . 0. sites are not optimized for visits from your location. tried the cell2mat function, all of the data ends up in one cell for some reason so it returns a [] matrix. Sie haben eine genderte Version dieses Beispiels. I thought of posting a C-Mex function, but as long as the type of the input is not clear, this would be a waster of time in 50% of the cases. But I will go with your second suggestion, which I thought wouldn't be very neat, but it's pretty fast. Matlab cell2mat with different data types. Convert numeric arrays in four cells of a cell array into one numeric array. For example given the cell array c: I can pad the cells with whatever character (say '@') using. It would be fairly trivial to write. The important part here is that I did not have to specify and know the maximum length in the cell array - pad function figures it out nicely. I need it for DNA sequences analysis. Do you see any ways to parallelize it? Cell arrays that contain the n inputs required for function func. Here is the fastest code that I currently use to achieve what I want: %Converts a read vector of chars or uint8s into an uint8 matrix padded, %with 0s based on the padded matrix string, %Locations of newline markers (ends of sequences), %Calculating lengths of sequences and shifting ends by 1 to remove eolns, %Max length of the sequence m and the number of sequences n, %Loading sequences into the new padded matrix. Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content, Extract data from cell array and include index of cell for identification, Extracting data from struct within matlab table, i2c_arm bus initialization and device-tree overlay. Mchten Sie dieses Beispiel mit Ihren nderungen ffnen? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. On the characters the very fast solution is simply function pad. Replace empty cells with logical 0's before cell2mat in MATLAB. Connect and share knowledge within a single location that is structured and easy to search. 9. Cell2mat for unequal lengths - MATLAB. Description. Can virent/viret mean "green" in an adjectival sense? Display the first field of structure d(1). To save space I convert the sequences from the lines of char text to cellarray of uint8s and then I would need a fast cell2mat with padding. cellfun works, but as you already mentioned cell2mat still fails, because of the string. Irreducible representations of a product of two groups. cellfun will apply your function to the contents of you cell array. 1. The elements of the cell array must all contain the same data type, and the resulting array is of that data type. Otherwise, the results are undefined. Cell arrays that contain the n inputs required for function func. A = cellfun (func,C) applies the function func to the contents of each cell of cell array C, one cell at a time. Calculate with arrays that have more rows than fit in memory. Is there a function being able to transform the whole cell to a matrix in double? If he had met some scary fish, he would immediately return to the surface. cell2mat is not supported for cell arrays containing cell arrays or objects. A = cellfun ('isclass', C, classname) returns logical 1 ( true) for each element of C that matches the classname string. m = cell2mat(c) converts a multidimensional cell array, c, with contents of the same data type into a single matrix, m.The contents of c must be able to concatenate into a hyperrectangle. Hi James, cool thanks for the remarks. How do I put three reasons together in a sentence? Convert cell array of matrices into single matrix. This MATLAB function applies the function func to the contents of each cell of cell array C, one cell at a time. must all contain the same data type, and the resulting array is of not accept objects or nested cells within C. This function fully supports tall arrays. Convert structures in a cell array into one structure array. Counterexamples to differentiation under integral sign, revisited. data type. A = cell2mat (C) converts a cell array into an ordinary array. The rubber protection cover does not pass through the hole in the rim. Add a new light switch in line with another switch? The structures must have the same fields. same number of columns, although they need not have the same number EDIT: I do not know beforehand which row is int32 and which is double, so it is not necessarily row 1 and 2. When I use cell2mat, the empty cells are ignored, and I end up with a matrix of solely 1's, with no reference to the previous index they held. The second method scatters the original row data throughout memory (the equivalent of doing a transpose copy), and I suspect that is why it runs so much slower. Webbrowser untersttzen keine MATLAB-Befehle. What happens if you score more than 99 points in volleyball? This function fully supports distributed arrays. Your posted method starts with rows but ends up with the data in columns. Why is Matlab is not reading an empty cell while running an if statement? Is this an at-all realistic configuration for a DHC-2 Beaver? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. rev2022.12.11.43106. I do not know beforehand which row is in32 and which is double, so it is not necessarily row 1 and 2, Or convert all values to doubles before calling. Obviously I could proccess them as chars using the above and convert into uint8s at the end, but this limits significantly the size of the data I can process in RAM in one go. The main purpose of the matlab function cell2mat is to convert from so called cell arrays to "normal" matlab matrices, where cell arrays correspond roughly to "normal" arrays ( List) in Mathematica and normal matlab matrices correspond roughly to what Mathematica calls "packed arrays". with a function handle, e.g. : Now the input is a "read vector" and can be char or uint8. What properties should my fictional HEAT rounds have to punch through heavy armor and ERA? your location, we recommend that you select: . Making statements based on opinion; back them up with references or personal experience. When I want to transform the whole cell with cell2mat, I get a mismatch error. . @mean. It seems to be that braking up, distribution and collection would eat out any benefits. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, Sorry, I now notice my description is incomplete. PSE Advent Calendar 2022 (Day 11): The other side of Christmas. missingCell = cellfun(@ismissing, T, 'UniformOutput',false); ismissing . Convert cell array of matrices into single matrix. This syntax returns logical 0 ( false) for objects that are a subclass of classname. timings on calling cellfun('isempty',mycellarray) vs cellfun(@isempty,mycellarray) for 367x367 sized cells (on a regular laptop): 'isempty': 0.002032 @isempty: 0.083621 Thx for the tip strange_dreams! There are 3 ways to specify the function: as a char array (only a handfull of functions, but they are faster when called like this)\. Feb 15, 2019 at 17:10. . Something can be done or not a fit? more information, see Tall Arrays. Partition large arrays across the combined memory of your cluster using Parallel Computing Toolbox. The input argument func is a function handle to a function that takes one input argument and returns a . When would I give a checkpoint to my D&D party that they can return to if they die? that data type. 0,7s in comparison to 47s with cellfun. This syntax returns logical 0 ( false) for objects that are a subclass of classname. A = cellfun (func,C) applies the function func to the contents of each cell of cell array C, one cell at a time. One row of the cell contains double values (such as 0.3421 0.5545 0.9199) and another row contains only int32 values (1 1 0). Why doesn't Stockfish announce when it solved a position as a book draw similar to how it announces a forced mate? Accelerating the pace of engineering and science. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Why does the USA not have a constitutional court? Description. cellfun then concatenates the outputs from func into the output array A, so that for the i th element of C, A (i) = func (C {i}). In the question you have mentioned a cell array. offers. It could even be multi-threaded if you really wanted to push the speed. The contents of C must support concatenation into an N-dimensional rectangle. 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