How do I find the percentage of a number of values within a certain range?

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John Hart
John Hart 2017-4-28
编辑： Guillaume 2017-4-28
I have a number of values which represent the differences between two surfaces. I would like to know the percentage of values which lie within a certain range e.g 0.05 and -0.05? How would I go about finding these values and then working out what percentage of the total?

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Stephen23
Stephen23 2017-4-28
编辑：Stephen23 2017-4-28
>> M = rand(6,7)-0.5; % matrix of fake data
>> X = -0.05<M & M<0.05; % check conditions
>> nnz(X)/numel(M)
ans = 0.095238
9.5% of the values of M are within the given conditions.

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Guillaume
Guillaume 2017-4-28
编辑：Guillaume 2017-4-28
sum(x > -0.05 & x < 0.05) / numel(x) %number of values between -0.05 and 0.05 divided by total number
Or if you want to do that with several interval, use histcounts with the 'Normalization', 'probability' option.
histcounts(x, -3.5:3.5, 'Normalization', 'probability'); %for example for 6 bins

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