Histogram - problem with X axis (shifting the data)

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Karolina 2016-1-9

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https://ww2.mathworks.cn/matlabcentral/answers/263199-histogram-problem-with-x-axis-shifting-the-data

回答： Guillaume 2016-1-11

I plotted a histogram which represent three data: A, B, C. The A represent the sum of B+C. I think there is something wrong with X axis (they are shifted for every data), because the C data for some values is higher than A. Does anyone know what can be wrong in my code?

% Generate histogram
h0=histogram(C,'BinLimits',[0.00,3.00],'FaceColor',[0.8 0.8 0.8],'EdgeColor','none','FaceAlpha',1);
hold on
h1=histogram(A,'BinLimits',[0.00,3.00],'FaceColor',[0 0 0],'EdgeColor','none','FaceAlpha',1);
hold on
h2=histogram(B,'BinLimits',[0.00,3.00],'FaceColor',[0.3 0.3 0.3],'EdgeColor','none','FaceAlpha',0.7);
hold on
xlim([0.1,1.4]);

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Image Analyst 2016-1-9

What is your C data? Is it the counts you're talking about, or the bin edges?

Or is it the actual C, which you say is equal to A+B. If B is negative then C could be less than A for a particular element.

Karolina 2016-1-11

My data are rasters. A represents a full extent od data. B and C are parts of A raster - that I why I wrote that B and C are the sum of A - but I did not summed the values. I want to represent the histogram o counts for A, B, and C. The C on my histogram is higher for positive values.

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Answer 1

Guillaume 2016-1-11

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My guess is that since you leave histogram to choose its own bins, your histograms don't have exactly the same bins. You can check the bins with:

h0.BinEdges  %it would make more sense to call h0: hC
h1.BinEdges  %it would make more sense to call h1: hA
h2.BinEdges  %it would make a lot more sense to call h2: hB

If that is indeed the problem, either fix the bins to start with, or reuse the bins of the first histogram in the seconds and thid:

hC = histogram(C, 'BinLimits',[0.00,3.00],'FaceColor',[0.8 0.8 0.8],'EdgeColor','none','FaceAlpha',1);
hold on
hA = histogram(A, hc.BinEdges, 'BinLimits',[0.00,3.00],'FaceColor',[0 0 0],'EdgeColor','none','FaceAlpha',1);
hB = histogram(B, hc.BinEdges, 'BinLimits',[0.00,3.00],'FaceColor',[0.3 0.3 0.3],'EdgeColor','none','FaceAlpha',0.7);