How can I accumulate cells of different lengths into a matrix in MATLAB?

by

Here’s one solution that uses cellfun with an anonymous function to first pad each cell with NaN values, then vertcat to put the cell contents into a matrix:

tcell = {[1 2 3], [1 2 3 4 5], [1 2 3 4 5 6], [1], []};  % Sample cell array

maxSize = max(cellfun(@numel, tcell));               % Get the maximum vector size
fcn = @(x) [x nan(1, maxSize-numel(x))];             % Create an anonymous function
rmat = cellfun(fcn, tcell, 'UniformOutput', false);  % Pad each cell with NaNs
rmat = vertcat(rmat{:});                             % Vertically concatenate cells

And the output:

rmat =

     1     2     3   NaN   NaN   NaN
     1     2     3     4     5   NaN
     1     2     3     4     5     6
     1   NaN   NaN   NaN   NaN   NaN
   NaN   NaN   NaN   NaN   NaN   NaN

More Related Contents:

  1. How can I index a MATLAB array returned by a function without first assigning it to a local variable?
  2. Matrix of unknown length in MATLAB?
  3. How do you concatenate the rows of a matrix into a vector?
  4. How do I visualize a matrix with colors and values displayed?
  5. Use a vector as an index to a matrix
  6. Is MATLAB row specific or column major?
  7. Difference between accessing cell elements using curly braces and parentheses
  8. How can I change the values of multiple points in a matrix?
  9. Construct adjacency matrix in MATLAB
  10. Replace specific columns in a matrix with a constant column vector
  11. How can I apply a function to every row/column of a matrix in MATLAB?
  12. How to select a submatrix (not in any particular pattern) in Matlab
  13. Get the indices of the n largest elements in a matrix
  14. How do I resize a matrix in MATLAB?
  15. Matrix “Zigzag” Reordering
  16. How can I divide each row of a matrix by a fixed row?
  17. Sorting entire matrix according to one column in matlab
  18. How to subtract a vector from each row of a matrix? [duplicate]
  19. Index of max and min value in an array
  20. How can I count the number of elements of a given value in a matrix?
  21. How can I sort a 2-D array in MATLAB with respect to one column?
  22. How do I divide matrix elements by column sums in MATLAB?
  23. General method to find submatrix in matlab matrix
  24. MATLAB find and apply function to values of repeated indices
  25. How to find out if a matrix is singular? [duplicate]
  26. Extract arbitrarily rotated plane of data from 3D array as 2D array
  27. How do I double the size of a vector in MATLAB with interpolation?
  28. MATLAB: Subtracting matrix subsets by specific rows
  29. Efficiently compute a 3D matrix of outer products – MATLAB
  30. Display matrix with row and column labels

Leave a Comment