Error: Index in position 2 exceeds array bounds.

Hi,

I have a loop that loops over the cells in "balls_xyz". If the loop encounters a cell that is empty it is supposed to skip that cell. However, when I run the code:

distances_balls_right = cell(size(balls_xyz)); % preallocate the distances cell array
distances_balls_left = cell(size(balls_xyz)); % preallocate the distances cell array

for i = 1:numel(balls_xyz)
    if isempty(balls_xyz(i))
        continue; % skip empty cells
    end
    this_cell = cell2mat(balls_xyz(i));
    right_hand = sqrt((this_cell(:,7)-this_cell(:,1)).^2 + (this_cell(:,8)-this_cell(:,2)).^2 + (this_cell(:,9)-this_cell(:,3)).^2);
    left_hand = sqrt((this_cell(:,7)-this_cell(:,4)).^2 + (this_cell(:,8)-this_cell(:,5)).^2 + (this_cell(:,9)-this_cell(:,6)).^2);
    distances_balls_right{i} = right_hand;
    distances_balls_left{i} = left_hand;
end

I get the error:

Index in position 2 exceeds array bounds.

right_hand = sqrt((this_cell(:,7)-this_cell(:,1)).^2 + (this_cell(:,8)-this_cell(:,2)).^2 + (this_cell(:,9)-this_cell(:,3)).^2);

Thanks!

Answer 1

[Cris LaPierre]

The problem is that your variable this_cell does not appear to have the number of columns that your code expects it to have. So it is not empty, but also not the expected size. The rest of your error message should be telling you the actual number of columns.

% Create a variable with 2 columns
A = rand(2)

A = 2×2

0.8845 0.4202 0.9545 0.7936

% Your error, caused by indexing the 3rd column, which doesn't exist
A(:,3)

Index in position 2 exceeds array bounds. Index must not exceed 2.