MATLAB: Histogram error at euclidian distance

histogramimage processing

Operator '-' is not supported for operands of type 'matlab.graphics.chart.primitive.Histogram'.
Dist1(i) = sqrt(sum((h1-h(i)).^2));
Both h are histogram objects.

Best Answer

I'm pretty sure someone already answered this today for you and told you that you need to get the bin counts. Look what happens if you leave off the semicolon -- you get an object with all kinds of properties on it:
>> h1 = histogram(rand(1, 1000))
h1 = 
  Histogram with properties:
             Data: [1×1000 double]
           Values: [95 93 86 107 101 114 96 97 109 102]
          NumBins: 10
         BinEdges: [0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1]
         BinWidth: 0.1
        BinLimits: [0 1]
    Normalization: 'count'
        FaceColor: 'auto'
        EdgeColor: [0 0 0]
So you need to do something like:
h1 = histogram(data1);
h2 = histogram(data2, h1.BinEdges); % Make sure it has the same bin edges as the first histogram.
counts1 = h1.Values;
counts2 = h2.Values;
Dist12 = sqrt(sum((counts1 - counts2) .^ 2));
or whatever you want to do or whatever formula you want.
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