MATLAB: Percentage values in scatterhist histogram

histogramMATLABpercentagescatterhist

Hello all,

I need a help with scatterhist and the information on each histogram.

For example lets have the next plot:

scatterhist(log(rand(1,100)),log(rand(1,100)),'Marker','o','Direction','out');

I would like to add (or get) values above the histogram bars; the percentage of the distribution.

Please, is anyone could help on it?

Thank you

Best Answer

The histograms are normalized which means their bar heights are already a percentage.

The percentage of each bar can be found in the demo below; look for

xHist.Values.*100
yHist.Values.*100

Here's now to access those axes and add text elements.

% Use output to get axis handles
h = scatterhist(log(rand(1,100)),log(rand(1,100)),'Marker','o','Direction','out');
% Get hist axis handles
xHist = findobj(h(2),'Type','histogram'); 
yHist = findobj(h(3),'Type','histogram');
% increase ylim/xlim to make room of text labels
h(2).YLim(2) = h(2).YLim(2).*1.2; % 20% increase;

h(3).YLim(2) = h(3).YLim(2).*1.2; % 20% increase;
% Compute bin centers and labels, add text
xBinCenter = xHist.BinEdges(2:end)-xHist.BinWidth/2;
xHistLabels = compose('%.0f%%',xHist.Values.*100);
text(h(2),xBinCenter, xHist.Values.*1.01, xHistLabels,...
    'HorizontalAlignment', 'Right', 'VerticalAlignment', 'middle', ...
    'FontSize', 8, 'Rotation', 90)
yBinCenter = yHist.BinEdges(2:end)-yHist.BinWidth/2;
yHistLabels = compose('%.0f%%',yHist.Values.*100);
text(h(3),yBinCenter, yHist.Values*1.01, yHistLabels,...
    'HorizontalAlignment', 'Right', 'VerticalAlignment', 'Middle', ...
    'FontSize', 8)

If you want to see the histogram axes,

axis(h(2), 'on')
axis(h(3), 'on')

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This demo adds labels above each bar.

To add the labels at the top but within the bars, change VerticalAlignment to Top.

y = [2 2 3; 2 5 6; 2 8 9; 2 11 12];
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% Get bar centers (tested in 19a)
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% Apply labels
text(xCnt(:),y(:),compose('%d',y(:)),'HorizontalAlignment','center','VerticalAlignment','bottom')
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●

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MATLAB: How to show bin counts’ percentage values in Histogram2 tile plot

I have solved it writing a function manually add text to each rectangle.

Here is the function:

function hHist = normalized_histogram2(hAxes,xVals,yVals,xEdges,yEdges)
% Creates a 2D Histogram plot of data counts percentage in each bins.
% Add percentage values as text inside each bin. 
% Font size and font weight can be changed manually inside the code or
% added to function inputs. 
% NOTE: If text does not fit the rectangles, change font size or maximize
% figure plot. 
%% inputs: 
% hAxes - axis handle object for the plot
% xVals - a double vector of x values
% yVals - a double vector of y values
% NOTE: xVals and yVals must be the same length
% xEdges - a double vector of x bins
% yEdges - a double vector of y bins
%% outputs:
% hHist - histogram object handle
hist_Counts = histcounts2(xVals,yVals,xEdges,yEdges);
hist_Counts_normalized = (hist_Counts / sum(hist_Counts,'all'))*100;
hHist = histogram2(hAxes,'XBinEdges',xEdges,'YBinEdges',yEdges,'DisplayStyle','tile','BinCounts',hist_Counts_normalized);
colorbar;
xBinCenters = hHist.XBinEdges - [0,diff(hHist.XBinEdges)/2];
yBinCenters = hHist.YBinEdges - [0,diff(hHist.YBinEdges)/2];
for i = 2:numel(xBinCenters)
    
    for j = 2:numel(yBinCenters)
        x_loc = xBinCenters(i);
        y_loc = yBinCenters(j);
        if ~(round(hHist.Values(i-1,j-1),2) == 0)
            text(hAxes,x_loc,y_loc,[num2str(round(hHist.Values(i-1,j-1),2)),'%'],'Color',[0 0 0],'FontSize',10,'FontWeight','bold');
        else
            continue
        end
        
    end
end

Here is the demo:

%% Data Creation:
xVals = randn(1,10000);
yVals = randn(1,1000)*5;
xEdges = min(xVals):1:max(xVals);
yEdges = min(yVals):5:max(yVals);
%% Demo:
hFig = figure;
hAxes = axes(hFig);
normalized_histogram2(hAxes,xVals,yVals,xEdges,yEdges);
% make plot look beautiful:
xlabel('X Data');
ylabel('Y Data');
title('Normalized Histogram 2');
hFig.WindowState = 'maximized';

It will look like below:

Best Answer

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