how to generate absolute difference between two different histograms

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Aashmi S 2019-8-28

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https://ww2.mathworks.cn/matlabcentral/answers/477892-how-to-generate-absolute-difference-between-two-different-histograms

回答： Aashmi S 2019-8-29

I have two histograms .i need to find absolute difference between those two histograms and generate histogram for that absolute difference.

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Answer 1

KALYAN ACHARJYA 2019-8-28

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编辑：KALYAN ACHARJYA 2019-8-28

在 MATLAB Online 中打开

data1=randi(100,1,100); % Just an example 
data2=randi(100,1,100); % Just an example 
diff=abs(hist(data1)-hist(data2));
result=hist(diff);

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Aashmi S 2019-8-28

i got the error

Attempt to execute SCRIPT hist as a function:

Error in code (line 45)

diff=abs(hist(data1)- hist(data2));

>>

KALYAN ACHARJYA 2019-8-28

在 MATLAB Online 中打开

Have you tried this code?

data1=randi(100,1,100); % Just an example 
data2=randi(100,1,100); % Just an example 
diff=abs(hist(data1)-hist(data2));
result=hist(diff);

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Answer 2

Steven Lord 2019-8-28

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https://ww2.mathworks.cn/matlabcentral/answers/477892-how-to-generate-absolute-difference-between-two-different-histograms#answer_389442

在 MATLAB Online 中打开

Let's create some sample data and a collection of edges that should span the data.

x1 = randn(1, 1e3);
x2 = randn(1, 1e3) + 0.25;
E = -5:0.25:5;

Show the first two histogram objects on separate axes with the same limits. If you don't need the individual histogram objects, call histcounts instead and use the output from those calls instead of the BinCounts properties of the histogram objects in the next step.

subplot(3, 1, 1)
h1 = histogram(x1, E);
subplot(3, 1, 2)
h2 = histogram(x2, E);
% Set the limits of the two axes containing each histogram to be the same
% First get the axes handles
ax1 = ancestor(h1, 'axes');
ax2 = ancestor(h2, 'axes');
% Set the X limits for both axes to be [-5 5] since that's the limit of our edges
xlim(ax1, [-5 5]);
xlim(ax2, [-5 5]);
% Get the Y limits of each axes
y1 = ylim(ax1);
y2 = ylim(ax2);
% The lower Y limit of each axes should be 0.
% The upper Y limit should be the greater of the two that histogram chose
%   based on the largest BinCount
consistentYlimits = [0, max(y1(2), y2(2))];
ylim(ax1, consistentYlimits);
ylim(ax2, consistentYlimits);

Now we'll show the absolute difference histogram.

absdiff = abs(h1.BinCounts - h2.BinCounts);
subplot(3, 1, 3);
h3 = histogram('BinCounts', absdiff, 'BinEdges', E);
% Set the limits of the third axes to be the same as those of the first two axes
ax3 = ancestor(h3, 'axes');
xlim(ax3, [-5 5])
ylim(ax3, consistentYlimits);