Average of a single element in an array

jawaher shah

2019 3 13

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Hello,

Im generating random numbers between (1 and 2) in 2D array. I want to get the average times of getting number (1) in the array. i tried to use M = mean(1,'all') and M = mean(1) but it didnt work out.

Thanks

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Rik 2019-3-13

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The best method depends on how you have generated your array. I will show two examples below.

%example 1: only integers
A=randi(2,200,200);
fraction_of_ones= sum(A==1,'all')/numel(A);
%example 2: non-integers as well
A=randn(200,200)+1.5;A(A<1)=1;A(A>2)=2;
tolerance=1e-3;
fraction_of_ones= sum(abs(A-1)<=tolerance,'all')/numel(A);