R2014b Histogram of multiple data sets

Question

Karen Pearson 2015-9-29

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/245838-r2014b-histogram-of-multiple-data-sets

编辑： the cyclist 2015-9-29

I'm trying to show histograms of four different vectors on a single set of axes and can't make it print them adjacent to one another, staggered, stacked, or anything other than right on top of each other.

code:

data1 = randn(20,1);
data2 = randn(30,1);
data3 = randn(40,1);
data4 = randn(50,1);
edges = -4:1:4;
histogram(data1,edges); hold on;
histogram(data2);
histogram(data3);
histogram(data4);  
%Technically, I did these all with 'Normalization', 'probability' too to equalize height

Even with transparency it's impossible to tell what it shows. I tried grouping the four vectors into one array (with gap from different length vectors filled by NaN), but then the histogram function groups all the data together into a single chart. I'd like to show it so that for each bin (like 0-1), there are four bars in different colors side-by-side, ideally with a gap before the next block of four so it's clear which ones go together. Thanks.

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Answer 1

the cyclist 2015-9-29

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/245838-r2014b-histogram-of-multiple-data-sets#answer_194107

编辑：the cyclist 2015-9-29

在 MATLAB Online 中打开

One way is to use the histcounts command to get the counts, and then use the bar command to do the plotting (because it will do the side-by-side):

    rng 'default'
    data1 = randn(20,1);
    data2 = randn(30,1);
    data3 = randn(40,1);
    data4 = randn(50,1);
    edges = -4:1:4;
    h1 = histcounts(data1,edges);
    h2 = histcounts(data2,edges);
    h3 = histcounts(data3,edges);
    h4 = histcounts(data4,edges);
    figure
    bar(edges(1:end-1),[h1; h2; h3; h4]')

I did not take great care to properly line up the "edges" variable with the counts. There are some nuances with respect to exactly how the binning is done. I suggest reading the documentation for histcounts.