Find the average in a window of random variables

Hi pls

I have 10 random variables ( 2,4,5,6,3,4,5,7,8,6)

I want to write a matlab code that will do this computation using 5 window length ( k = 5)

1st window length (2,4,5,6,3)

2nd window length ( 4,5,7,8,6)

then I can find the average of each windom numbers

1st window average = 4

2nd window average = 6

Thanks in advance

Thanks in advance

[Fangjun Jiang]

You should have enough experience to do it on your own.

[Tino]

If I can then I wouldnt be asking for help

[darova]

70 questions asked. Hello

Answer 1

[Adam Danz]

Matlab has movmean() but it I don't think it can move by groups of n elements.

This demo below computes a moving average for values [1:n, 1*n+1:2*n, 2*n+1:3*n, 3*n+1:4*n, etc...]

If the number of data points is not dividible by n, the data are padded with NaN values and the last average will only consider non-nan values.

data = 1:22; % Demo data
winSz = 5;   % Window size

% Reshape data into matrix.
% NOTE: 'data' must contain a number of element divisibly by 'winSz'.
% Otherwise, 'data' will be padded with NaN values so that it is 
% divisible by 'winSz'.
if rem(numel(data),winSz)>0
    nanAppend = nan(winSz - rem(numel(data),winSz),1);
else
    nanAppend = [];
end
dataMat = reshape([data(:); nanAppend], winSz, []);
movingAverage = mean(dataMat,1,'Omitnan');

% Result
% movingAverage =[3 8 13 18 21.5]

To compute the means of groups that share endpoints (e.g. indices 1:5, 5:9, 9:13, ...), see this answer.