Conversion to cell from double is not possible

I don't understand why I am getting this error.

1. This works...

onset_time_first = cell(ratio_channels,4);
onset_time_first (:, 1) = cellfun(@(x,y,z)(cusum(x, climit, mshift, y, z)), beta_cell(:, 1), beta_cell (:, 2), beta_cell (:, 3), 'UniformOutput', false);

Here beta_cell is a 189x3 cell. This is repeated 3 more times.

2. This does not work...

onset_time_second = cell(ratio_channels,4);
onset_time_second (:, 1) = cellfun(@(x)(findchangepts(x, 'Statistic', 'mean')), beta_cell_second);

Here beta_cell_second is a 189x1 cell. This is repeated 3 more times.

The syntax is identical but the first works and the second doesn't. It doesn't help to add "beta_cell_second(:))"

Answer 1

[OCDER]

If you want the output to be a cell in the case 2, you have to do this

onset_time_second = cell(ratio_channels,4);
onset_time_second (:, 1) = cellfun(@(x)(findchangepts(x, 'Statistic', 'mean')), beta_cell_second, 'UniformOutput', false)

To help you understand, try this:

 A = num2cell(1:10);
 O = cell(1, 10);
 B = cellfun(@(x) x(1), A); %Returns double matrix
 C = cellfun(@(x) x(1), A, 'un', 0); %Returns cell array
 O(:) = B; %ERROR! Conversion to cell from double is not possible
 O(:) = C; %OKAY!