how to plot histogram from an array ?

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noble amin 2021-12-22

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评论： Image Analyst 2021-12-22

Hi everyone, what the simplest code to plot a histogram from this table ?

( x-axis for frequencies ; y-axis for the numbers )

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Answer 1

Image Analyst 2021-12-22

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Try putting each of those into a vector. The x axis is actually Number, not frequency, and the bin heights (the counts) are actually the frequency. So you'd do

frequency = [3,9,13,21,9,4,1];

Number = linspace(11.945, 12.035, length(frequency));

bar(Number, frequency);

xlabel('Number');

ylabel('Frequency (count)')

grid on;

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Image Analyst 2021-12-22

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@noble amin I don't know how you're getting your original numbers but there is a variety of ways to read them in from a text file, like readmatrix(), importdata(), csvread(), etc. Once you have the numbers, if you want to put them into a table variable type you can use table() like this:

frequency = [3,9,13,21,9,4,1];

Number = linspace(11.945, 12.035, length(frequency));

t = table(Number(:), frequency(:), 'VariableNames', {'Number', 'frequency'})

t = 7×2 table

Number frequency ______ _________ 11.945 3 11.96 9 11.975 13 11.99 21 12.005 9 12.02 4 12.035 1

bar(t.Number, t.frequency);

xlabel('Number');

ylabel('Frequency (count)');

grid on;

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