Finding the mean value of a set.

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Erfan Parviz
Erfan Parviz 2022-11-9
回答： Steven Lord 2022-11-9
Let's say that I have a set of numbers, for example x= [1 2 4 6 2 7 8 4 5 7 8 9]. I want to calculate the mean value for every 3 numbers. In this case first 1 2 4 , then 6 2 7 and so on. How do I do? should I use any functions?
in fact I have a column containing 180000 numbers. and I want to calculate the mean value for every 50 numbers. Totally 180000/50=3660 mean values. I would appreciate every suggestion.

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Steven Lord
Steven Lord 2022-11-9
Ran in:
Original data:
x= [1 2 4 6 2 7 8 4 5 7 8 9]
x = 1×12
1 2 4 6 2 7 8 4 5 7 8 9
Reshape it into a 3-by-whatever matrix. I'll let MATLAB figure out what "whatever" is.
A = reshape(x, 3, [])
A = 3×4
1 6 8 7 2 2 4 8 4 7 5 9
Take the mean in dimension 1 (down the columns.)
m = mean(A, 1)
m = 1×4
2.3333 5.0000 5.6667 8.0000

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