How to draw an histogram?

How do I draw an histogram knowing the number of times all elements in a 150x150 matrix appears using matlab?

Answer 1

[Adam Danz]

> How do I draw an histogram knowing the number of times all elements in a 150x150 matrix appears using matlab?

Both histogram and histogram2 offer two types of syntaxes. One syntax lets you input the raw data so that the function can compute the density of each bin. The second lets you enter the bins and densities yourself.

It sounds like you want the second but it's unclear whether your density data are a vector (use histogram) or a matrix (use histogram2).

Here is an example of both.

histogram

histogram('BinEdges',edges,'BinCounts',counts)

counts = [12.5 38.9 4.2 9.8 28.22 11.1];
binEdges = [2 4 6 8 10 12 14];
figure()
histogram('BinEdges', binEdges, 'BinCounts', counts)

histogram('Categories',Categories,'BinCounts',counts)

cats = categorical([2 4 6 8 10 12]);
figure()
histogram('Categories', cats, 'BinCounts', counts)

histogram2

histogram2('XBinEdges',Xedges,'YBinEdges',Yedges,'BinCounts',counts)

counts = magic(5)

counts = 5x5

17 24 1 8 15 23 5 7 14 16 4 6 13 20 22 10 12 19 21 3 11 18 25 2 9

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xBinEdges = [-2 -1 0 1 2 3];
yBinEdges = [10 20 30 40 50 60];
figure()
histogram2('XBinEdges',xBinEdges,'YBinEdges',yBinEdges,'BinCounts',counts)

[Prince]

This is the right question: How do I draw an histogram knowing the frequency of all the individual elements in a 150x150 matrix appears using matlab?

Answer 2

[Athanasios Paraskevopoulos]

f you already have the matrix, use it directly. If not, here is an example of how you can generate a random matrix with integers for demonstration purposes:

% Generate a 150x150 matrix with random integers from 1 to 100
matrix = randi(100, 150, 150);  

% Flatten the matrix to a vector
flattenedMatrix = matrix(:);  

% Plot histogram using the appropriate method
histogram(flattenedMatrix, 'BinMethod', 'integers');
xlabel('Element value');
ylabel('Frequency');
title('Element frequency in 150x150 matrix');

[Prince]

This is the right question: How do I draw an histogram knowing the frequency of all the individual elements in a 150x150 matrix appears using matlab?