Averaging values in Column B based on serial date in column A

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Claire
Claire 2020-7-8
评论： Tommy 2020-7-8
Hello
I have an array that looks like:
col A col B
737585 1
737585 2
737585 3
737586 4
737586 5
737586 6
where column A is the serial date and column B is the respective value. I need a for loop that will average the values in col B that have the same serial date as in column A. Thank you!
ex: serial date: 737585 avg: 1+2+3/3 = 2

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Tommy
Tommy 2020-7-8
Does it need to be a loop? I believe this will work:
groups = findgroups(yourArray(:,1));
avg = splitapply(@mean, yourArray(:,2), groups);

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