# mean of matrix elements

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john creighton on 15 Oct 2014
Commented: john creighton on 16 Oct 2014
hey all. i have a 5760x1 matrix. i need to find the average of the first 10 elements, remove the 10 elements and replave with the averaged number, find the average of the next 10 elements, remove those 10 elements and replace with average and so on.... could anyone give me an insight as to how to do this? much appreciated john

Sean de Wolski on 15 Oct 2014
B = mean(reshape(x,10,[]))'
Where x is your original column vector and B is the mean of every 10x1 chunk

### More Answers (3)

Andrew Reibold on 15 Oct 2014
Edited: Andrew Reibold on 15 Oct 2014
myMatrix = rand(5760,1)
for jj = 1:576
moving_avg(jj,1) = mean(myMatrix(jj*10-9:jj*10));
end
Will make a matrix called 'moving_avg' where each point represents the average of each set of 10 points.
Is that what you wanted? It will be 1/10 the size.

#### 1 Comment

Andrew Reibold on 15 Oct 2014
Its very easy to replace every single point with the average too if thats what you need. (Same size, but every set of 10 numbers are all the same averaged number.)

Andrei Bobrov on 16 Oct 2014
I want have 'vote' too!
out = accumarray(ceil((1:numel(x))'/10),x(:),[],@mean);

Sean de Wolski on 16 Oct 2014
b=blkproc(rand(5760,1),[10,1],@mean)
I can't think of a solution shorter than my reshape one in terms of Code Golf?
john creighton on 16 Oct 2014
haha. yours works too...so well deserved 'vote' :)

john creighton on 16 Oct 2014
Both answers worked perfectly. Thanks guys. sorry can only accept one answer lol

#### 1 Comment

Sean de Wolski on 16 Oct 2014
You can vote too :)