https://www.mathworks.com/help/matlab/ref/discretize.html . Or in older MATLAB you can do much the same thing with the second output of histc()
If you do not have fixed edges then you could use uniquetol()
The idea is that you find grouping numbers based upon the values.
Once you have those, you can use grpstats() from the Statistics Toolbox. Or you can use
[~, ~, bin_numbers] = uniquetol(A);
avg = accumarray(bin_numbers(:), A(:), [], @mean ).'
