MATLAB: Using mean function

data analysismathematics

Hello, I am new to matlab and I try to find a solution to a simple problem I have.

I have a column of values and I want to calculate mean values with a certain step, e.g. calculate the mean of values 1-6, then the mean of values 7-12 etc …

Can someone please give any ideas on how to do this?

Thank you, George

Best Answer

The reshape command can help to implement this:

X = rand(18,1)
Y = reshape(X,6,[])
mean(Y)

or more simply, just:

mean(reshape(X,6,[]))

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This is MATLAB, so here is a much simpler solution without any loops:

M  = C1(1:399,5:11);
R  = mean(permute(M,[3,2,1]).*permute(M,[2,3,1]),3);
R0 = mean(M.*C1(1:399,13),1).';
B  = pinv(R)*(R0)

And compared against the output of your code:

>> isequal(A,B)
ans = 1

For MATLAB versions prior to R2016b you will need replace the .* operators with bsxfun and times.

Best Answer

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