Adding text to plot with random inputs

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Sarah Gomez
Sarah Gomez 2022-2-10
回答： Walter Roberson 2022-2-10
Ran in:
clc;
clear;
y=20*randn(1,100000)+80;
histogram(y,11)
title('Normal Distribution')
xlabel('Value');
ylabel('Count');
txt={'\mu = 80'};
text(80,3.3*10^4, txt);
txt={'\sigma = 20'};
text(100, 3.3*10^4, txt);
I have code that takes a random input and creates a histogram that always has the mean = 80 and standard deviation =20. My question is how do I add text to the plot so that my text '\sigma = 20' is always above the exact mean, which should be 80. I've chosen a large y value just to prevent the text being inside the bar but I'd like it to be on top of the bar no matter the value. The standard deviation text can go anywhere, but preferably close to the mean text.

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回答（2 个）

Arif Hoq
Arif Hoq 2022-2-10
Ran in:
y=20*randn(1,100000)+80;
histogram(y,11)
title('Normal Distribution')
xlabel('Value');
ylabel('Count');
txt1={'\mu = 80'};
txt2={'\sigma = 20'};
text(80,3.3*10^4, txt1,'HorizontalAlignment','center','VerticalAlignment','top');
text( 80, 3.3*10^4, txt2,'HorizontalAlignment','center','VerticalAlignment','bottom');
Walter Roberson
Walter Roberson 2022-2-10
Ran in:
y=20*randn(1,100000)+80;
histogram(y,11)
title('Normal Distribution')
xlabel('Value');
ylabel('Count');
actual_mu = mean(y);
actual_sigma = std(y);
txtmu = "\mu = " + round(actual_mu,2);
txtsigma = "\sigma = " + round(actual_sigma,2);
text(actual_mu, 3.3*10^4, txtsigma); %yes, sigma is the one placed at mu
text(actual_mu + 20, 3.3*10^4, txtmu);

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