How does one plot a histogram from the histogram counts?

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Brando Miranda 2017-3-27

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评论： the cyclist 2017-3-28

I have produced an array of counts, specifically produced with:

histcounts

the reason I do this is because storing the actual data is way to expensive in terms of storage. So on the fly I update my histcount. Now that I have them, how do I plot the histogram?

----

demo code:

W_hist_counts = zeros(1,D);
for i=2:iter+1
    W = get_vector_we_want_stats(W)
    %
    W_hist_counts = W_hist_counts + histcounts(W,nbins);
end

----

http://stackoverflow.com/questions/43058290/what-is-the-official-matlab-way-to-plot-the-values-of-histcounts-into-a-histogra

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Answer 1

the cyclist 2017-3-27

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The most straightforward way is probably to use the bar command.

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Brando Miranda 2017-3-27

also, bar doesn't accept normalization options. I know histcounts does but that forces me to have all the data before I feed it to histcounts, which I don't have because I am in the real of big data. I can produce statistics (like counts) on the fly but not store the whole thing in matlab.

the cyclist 2017-3-28

在 MATLAB Online 中打开

I assume you want to normalize to an overall sum of 1. You should just be able to plot

W_hist_counts/sum(W_hist_counts)

to normalize, right?

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Answer 2

Image Analyst 2017-3-27

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https://ww2.mathworks.cn/matlabcentral/answers/332178-how-does-one-plot-a-histogram-from-the-histogram-counts#answer_260578

histogram() can plot the histogram data (counts vs values) if you pass in the counts and values instead of the data. Otherwise you can do it manually with bar().