How can one put mean and std of the data into histogram using annotation?

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  5 Comments
Steven Lord
Steven Lord on 15 Aug 2020
Can you show a picture of what you want the histogram with annotation to look like? That may help us suggest the best options.
Personally I might just go with xline objects.
x = randn(1, 1e5);
histogram(x)
xline(mean(x), 'LineStyle', '--', 'Color', 'r', 'LineWidth', 2)
xline(std(x), 'LineStyle', ':', 'Color', 'c', 'LineWidth', 1.5)
xline(-std(x), 'LineStyle', ':', 'Color', 'c', 'LineWidth', 1.5)
alpedhuez
alpedhuez on 15 Aug 2020
Edited: alpedhuez on 15 Aug 2020
  • Is it possible to have a box in text()?
  • xline example does not display mean and std numbers. how can one display these info?

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Accepted Answer

Image Analyst
Image Analyst on 15 Aug 2020
Perhaps you wanted this:
data = rand(1, 100000);
numBins = 400;
histogram(data, numBins, 'EdgeColor', 'none');
grid on;
xlabel('Data Value', 'FontSize', 15);
ylabel('Count', 'FontSize', 15);
% Compute mean and standard deviation.
mu = mean(data)
sigma = std(data)
% Indicate those on the plot.
xline(mu, 'Color', 'g', 'LineWidth', 2);
xline(mu - sigma, 'Color', 'r', 'LineWidth', 2, 'LineStyle', '--');
xline(mu + sigma, 'Color', 'r', 'LineWidth', 2, 'LineStyle', '--');
ylim([0, 400]); % Give some headroom above the bars.
yl = ylim;
sMean = sprintf(' Mean = %.3f\n SD = %.3f', mu, sigma);
% Position the text 90% of the way from bottom to top.
text(mu, 0.9*yl(2), sMean, 'Color', 'r', ...
'FontWeight', 'bold', 'FontSize', 12, ...
'EdgeColor', 'b');
sMean2= sprintf('Histogram with %d bins. Mean = %.3f. SD = %.3f', numBins, mu, sigma);
title(sMean2, 'FontSize', 15);
Adapt as needed.

More Answers (1)

Sulaymon Eshkabilov
Sulaymon Eshkabilov on 15 Aug 2020
Hi,
A user can fully control the location of the legend by indicating its location as:
legend({sprintf('mean = %3.2f, std = %3.2f', mean(D), std(D))}, 'location', 'best') % Puts the legend automatically on an empty spot
legend({sprintf('mean = %3.2f, std = %3.2f', mean(D), std(D))}, 'location', 'southwest') % Puts on the lower left corner
legend({sprintf('mean = %3.2f, std = %3.2f', mean(D), std(D))}, 'location', 'southeast') % Puts on the lower right corner
legend({sprintf('mean = %3.2f, std = %3.2f', mean(D), std(D))}, 'location', 'northwest') % Puts on the upper left
legend({sprintf('mean = %3.2f, std = %3.2f', mean(D), std(D))}, 'location', 'southeast') % Puts on the upper right

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