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

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alpedhuez 2020-8-13

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编辑： alpedhuez 2020-8-15

https://www.mathworks.com/matlabcentral/answers/303281-i-am-new-to-matlab-i-want-to-display-the-standard-deviation-and-the-mean-on-a-histogram-can-i-get

discusss how to put mean and std information in legend of histogram. But I would like to put these information in annotation

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

Please advise.

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Steven Lord 2020-8-15

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 2020-8-15

编辑：alpedhuez 2020-8-15

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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Answer 1

Image Analyst 2020-8-15

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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.

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alpedhuez 2020-8-15

编辑：alpedhuez 2020-8-15

Thank you. True text() is better.

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Answer 2

Sulaymon Eshkabilov 2020-8-15

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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