How do I create a histogram with y axis being count, and x-axis being 20 different possible values?

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Lakyn 2016-8-24

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评论： Lakyn 2016-8-25

Hello,

I have a 76x76 matrix that I would like to convert into a histogram. All the values in it range from -1 to 1, but I only want to use the top triangle values, triu(A,1).

so I would like 21 beams on X-axis ranging from -1,-0.9,-0.8...,0.8,0.9,1.0. The Y-axis will be the amount of entries in the matrix that fit in that particular beam, e.g. 0.62 and 0.60 would both be in the 0.6 beam.

Thank you very much.

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Image Analyst 2016-8-24

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I assume you tried the really obvious route -- the histogram() function. So you'll have to let us know why this isn't working for you.

upperTriangle = logical(triu(ones(size(A)), 1));
edges = -1 : 0.1 : 1;
histogram(A(upperTriangle), edges);
grid on;
xlabel('Value');
ylabel('Count');

Why doesn't this work? It seems simple enough, and seems like it should work.

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Image Analyst 2016-8-25

Plus, you can't call your function histogram(). There is already a function called histogram(), and you just destroyed it. So now your histogram() function calls itself recursively - NOT what you want.

Lakyn 2016-8-25