Fill color inside stair.

Hi @Yang Hu,

You have already created the histograms using the histogram function. This part of your code is correct and will generate the stair plots. To fill the area under the stairs, you need to extract the x and y data from the histogram objects. The Values property of the histogram will give you the heights of the bars, and the BinEdges property will provide the x-coordinates. Then use the fill function to create filled areas under the stair plots. This function will require the x-coordinates and y-coordinates of the vertices of the polygon you want to fill. Let me illustrate by implementing these steps in code below. For more information on this function, please refer to

https://www.mathworks.com/help/matlab/ref/fill.html

%  data

data1 = randn(1000, 1); % Replace with your actual data

data2 = randn(1000, 1); % Replace with your actual data

figure;

% Create the first histogram

h1 = histogram(data1, 'BinWidth', 0.1, 'DisplayStyle', 'stairs', 'Normalization', 

'probability');

h1.EdgeColor = 'k';  

h1.LineWidth = 2;  

% Hold on to plot the second histogram

hold on;  

% Create the second histogram

h2 = histogram(data2, 'BinWidth', 0.1, 'DisplayStyle', 'stairs', 'Normalization', 

'probability');

h2.EdgeColor = [0.772, 0.012, 0.314];  

h2.LineWidth = 2;  

% Set x-axis limits and ticks

xlim([0 2]);  

xticks(0:0.1:2);  

% Customize font and frame properties

ax = gca;  

ax.FontSize = 16;  

ax.FontWeight = 'bold';  

ax.LineWidth = 4;  

% Fill the area under the first histogram

x1 = [h1.BinEdges, h1.BinEdges(end)]; % X-coordinates

y1 = [0, h1.Values, 0]; % Y-coordinates

fill(x1, y1, 'k', 'FaceAlpha', 0.2, 'EdgeColor', 'none'); % Fill with black color

% Fill the area under the second histogram

x2 = [h2.BinEdges, h2.BinEdges(end)]; % X-coordinates

y2 = [0, h2.Values, 0]; % Y-coordinates

% Fill with specified color

fill(x2, y2, [0.772, 0.012, 0.314], 'FaceAlpha', 0.2, 'EdgeColor', 'none'); 

hold off; % Release the hold on the current figure

Please see attached.

Note: Replace data1 and data2 with your actual datasets. Hope this helps.

If you have any further questions or need additional assistance, feel free to ask!