Using histogram() data without plotting or calculating the figure.

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Thomas Houllier 2016-1-9

4
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https://ww2.mathworks.cn/matlabcentral/answers/263215-using-histogram-data-without-plotting-or-calculating-the-figure

评论： Erik Lindskog 2022-10-12

Hi, this is my first post here.

I really need to optimize a function so as to make it as fast as possible. In it, I use the histogram function. All I need is the histogram().Values and histogram().BinEdges data. I don't need to plot anything and I need to keep the computation time to the bare minimum. The code I use is roughly:

fig=figure; set(fig,'visible','off');
H=histogram(...);
h=H.Values;
b=H.BinEdges;
% Some data treatment
%%%%
close(fig);

By doing 'tic-tocs' I found out that these precise lines were taking up 90% of the execution time. Is there any way to have access to the histogram data without opening a figure, or any other way of optimizing time ? I mean not opening a figure at all, not just hiding it, as I've already done that.

Thanks in advance !

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Erik Lindskog 2022-10-12

Possibly a different way to compute a histogram without plotting a figure is to use the function histcounts to compute the histogram counts and edges. Later the histogram can then be plotted with the histogram function.

E.g.:

[counts, edges] = histcounts(data, 100) % Computes the histogram counts and edges for 'data' without plotting

...

histogram('BinEdges', edges, 'BinCounts', counts) % Plots a histogram with edges 'edges' and counts 'counts'.

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