Matlab分组条形图X轴刻度自定义及Y轴值修改技术问询

Let's tackle your two requirements step by step, with a complete modified code and clear explanations:

Modified Full Code #

% Original data - handle NaN replacement first
y = [200 200 200 192 160 128 96 64 48 32 96 64 24 48 32; 
     48 64 96 48 32 24 24 64 16 24 48 32 48 64 24; 
     6 6 2 4 4 6 12 8 2 4 8 6 16 12 6; ];

% Requirement 2: Replace all 200 values with NaN
y(y == 200) = NaN;

[rows,cols] = size(y);
n = NaN(rows,cols);
bh = cell(rows,1);
lh = cell(rows,1);
hold on;
for k = 1:rows
    curr = n;
    curr(k,:) = y(k,:);
    bar1 = bar(curr,'FaceColor',rand(1,3));
    bh{k} = bar1;
    lh{k} = bar1(1);
end
hold off;

% Requirement 1: Add specific numbers below each bar
% Define your custom numbers here (example uses y-values; replace with your own set if needed)
specific_nums = y;
% Adjust vertical position for text (tune based on your plot's scale)
text_y_pos = -10;

% Loop through every bar to add text
for k = 1:rows
    for idx = 1:cols
        bar_x = bh{k}(idx).XData;
        display_num = specific_nums(k,idx);
        % Skip NaN values since those bars don't exist
        if ~isnan(display_num)
            text(bar_x, text_y_pos, num2str(display_num), ...
                'HorizontalAlignment','center', ...
                'FontSize',10, ...
                'FontWeight','normal');
        end
    end
end

% Keep your original labels and legend
legend([lh{:}],{'1st group','2nd group', '3rd group'},...
    'fontweight','bold','Location','best','FontSize',12);
xlabel('Samples (45 Locations) ','fontweight','bold','FontSize',12);
ylabel('Distance Error (meters)','fontweight','bold','FontSize',12);
% Adjust y-axis limits to prevent text from being cut off
ylim([text_y_pos-5 max(y(:),[],'omitnan')+10]);

Key Breakdown of Changes #

1. Replacing 200 with NaN #

• We use logical indexing y(y == 200) = NaN; to target every element equal to 200 and swap it with NaN in a single line. This ensures those positions won't render any bars in your plot.

2. Adding Specific Numbers Below Bars #

• First, set up your specific_nums array: this can be the original y-values (as shown) or any custom set of numbers you need to display (just make sure it matches the rows x cols size of your data).
• We loop through each bar in every group, fetch its x-position using bar.XData, then use the text() function to place the number below the bar.
• We skip NaN values since those bars don't exist, so no text is needed for them.
• The ylim() adjustment ensures the text below the x-axis isn't cut off — feel free to tweak text_y_pos and the y-limits to fit your plot's scale.

内容的提问来源于stack exchange，提问作者Mohsen Ali