Inserting new values to cell array[MATLAB]

Question

[EDIT]

Say, I have a cell array A consisting of n cells and each of them is a zero vector of size (m,1).

Example: A is a 1x2 cell array A = [100x1 double] [100x1 double]

How can I insert new values to each cells, on the same rows and at the same time without having to write separate lines of code? Can I use cellfun to do so?

For instance, how can I replace the ithrow of the first cell with the new value m and the ithrow of the second cell with the new value n, using a single line of code?

m and n may or may not be the same values.

I don't understand, are the cell contents always vectors, Mx1, or are they matrices, MxN? Also, in your question, do you want to assign m to one cell and n to the other one, or two separate columns in row i? — Trogdor
Please provide a minimal reproducible example. Are you trying to replace existing rows, add new rows in the middle of each vector, or something else? — beaker
@nashynash That would be the place to do it. And now that I've seen your previous question, I have to ask why you've chosen not to use a multidimensional array rather than a cell array (assuming the matrices are all the same size, of course). — beaker

rahnema1 rahnema1 · Accepted Answer · 2016-09-01T16:58:20

as in comments noted you may try other options such as array for its efficiency, however as an answer to the question you can use evalin function and using change_cell you can for example change contents of second row fo each cell to the vals just in one line of code!:

A = {[1 2 3],[4 5 6]};
change_cell = @(rownum , vals) evalin(...
                                    'base', ...
                                    [...
                                        'rownum =', int2str(rownum),';',...
                                        'vals=[', num2str(vals),'];',...
                                        'for i = 1:length(A);',...
                                            'A{i}(rownum)=vals(i);',...
                                        'end;'...
                                    ]);
change_cell(2, [6 8])

Inserting new values to cell array[MATLAB]

1 Answers