Looping through cell array in order

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Josh 2014-12-10

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评论： Josh 2014-12-11

I'm drawing squares on a grid. The squares need to have an ID as set within a cell array. I was expecting the ID to loop through each ID in the cell in order by instead it cycles through in rows.

&nbsp

    cell_id = cell(1, 2); % 1 x 5 cell array
    cell_id{1, 1} = 1365; 
    cell_id{1, 2} = 1256; 
    cell_id{1, 3} = 6214;     
    cell_id{1, 4} = 2587; 
    cell_id{1, 5} = 1564;
    hold on
    for i = 1:2:12
        count = 1;
        for ii = 1:2:12
            plot(1*i , 1*ii, 's', 'MarkerSize', 50);
            if (count <= 5)
                id = cell_id(1,count);
                text(1*i, 1*ii, ['ID:',id]);
                count = count + 1;
            elseif (count > 5)
                id = cell_id(1,1);
                count = 1;
                text(1*i, 1*ii, ['ID:',id]);
            end
        end
    end

Any ideas, thanks.

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per isakson 2014-12-10

编辑：per isakson 2014-12-10

Do you expect 4 rows times 6 columns of boxes?
Replace i by xx and ii by yy or something associated with directions
Set the axes limits before adding the boxes. It's confusing that the limits change all the time
And format the code properly. (I did it this time.)

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Guillaume 2014-12-10

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You appear to be a bit confused about a few things:

cell_id = cell(1, 2);

declares a 1 x 2 cell array, not a 1 x 5. Anyway, you could replace your first two lines with:

cell_id = {1365, 1256, 6214, 2587, 1564};

Secondly, you reset your count for each column, since it's set to one in the first for loop. You probably meant to do the assignment to 1 before the first loop.

Also, use more descriptive variables than i and ii. row and col would be better.

To sum it up:

figure; axis off; hold on;
cell_id = {1365, 1256, 6214, 2587, 1564};
count = 1;
for col = 1:2:12
  for row = 1:2:12
     plot(col, row, 's', 'MarkerSize', 50);
     text(col, row, sprintf('ID:%d', cell_id{count}));
     count = mod(count, numel(cell_id)) + 1;
  end
end