cell-array

I initialized a very long cell array(vector?) train_labels = cell(16218, 1); These will be populated using files from 50 different folders, to make sure that the files are indexed in the right location, I need the index of the last cell array that was written to. For example after reading one folder, the index in train_labels had reached 5406 . Now to read the images from the next folder they must be saved to the next index that is 5407 . To make that work I need to find the location of the last non-empty array in train_labels . Since the simple find(train_labels,1,'last') does not work on

I have a cell like this: A{1,1}=[ 1 ;2; 3;]; A{2,1}=[ 4 ;2;]; A{3,1}=[ 3 ;2; 5; 4; 6;]; ... A{N,1}=[ 10 ;2;5; 7;]; %N is very large. In other words, the number of columns in each element of this cell is different, with no definite pattern. Now, I want to sort these elements based on the element at the first column . I mean, I want the result to be like this: Asorted{1,1}=[ 1 ;2; 3;]; Asorted{2,1}=[ 3 ;2; 5; 4; 6;]; Asorted{3,1}=[ 4 ;2;]; ... Asorted{N,1}=[ 10 ;2;5; 7;]; Currently I use this function: function Asorted = sortcell(A) B=[]; nrows = size(A,1); for i=1:nrows % this for-loop is slow

How can I concatenate: A = {'hello'; 'hi'; 'hey'} with B = {'Ben'; 'Karen'; 'Lisa'} with a space in between to get: C = {'hello Ben'; 'hi Karen'; 'hey Lisa'} Is there a fast non-looping way? You can use strcat() , although it performs a loop: strcat(A,{' '}, B) where the blank is preserved by enclosing it within a cell. Alternatively, FEX:CStrCatStr is a mex routine which achieves a 10x speedup (depending on testing environment): CStrCatStr(A,' ', B) A faster (albeit less elegant) alternative to strcat that concatenates strings is a combination of the sprintf and textscan commands: C = [A; B];

I have created a function which takes vectors for input variables and returns a cell array for each set of inputs. The final output variable (out) seems to consist of a 2x1 cell containing two 1x5 cells. I have provided a screenshot of this below: I am just trying to figure out how to flatten the cell array (out) to be a 2x5 cell array. One way to achieve that would be - vertcat(cell_array1{:}) If your cell has unequal number of elements in each row , maybe this might work better vector=[cell_array{:}] 来源： https://stackoverflow.com/questions/23334819/flattening-a-cell-array

I've created a m x n cell array using cell(m,n) , and filled each of the cells with arbitrary strings. How do I output the cell array as a CSV file, where each cell in the array is a cell in the CSV 'spreadsheet'. I've tried using cell2CSV , but I get errors ... Error in ==> cell2csv at 71 fprintf(datei, '%s', var); Caused by: Error using ==> dlmwrite at 114 The input cell array cannot be converted to a matrix. Any guidance will be well received :) Here is a somewhat vectorized solution: %# lets create a cellarray filled with random strings C = cell(10,5); chars = char(97:122); for i=1:numel(C

I have cell array A of dimension m * k . I want to keep the rows of A unique up to an order of the k cells . The "tricky" part is "up to an order of the k cells" : consider the k cells in the i th row of A , A(i,:) ; there could be a row j of A , A(j,:) , that is equivalent to A(i,:) up to a re-ordering of its k cells, meaning that for example if k=4 it could be that: A{i,1}=A{j,2} A{i,2}=A{j,3} A{i,3}=A{j,1} A{i,4}=A{j,4} What I am doing at the moment is: G=[0 -1 1; 0 -1 2; 0 -1 3; 0 -1 4; 0 -1 5; 1 -1 6; 1 0 6; 1 1 6; 2 -1 6; 2 0 6; 2 1 6; 3 -1 6; 3 0 6; 3 1 6]; h=7; M=reshape(G(nchoosek(1