Averaging every n elements of a vector in matlab

Question

I would like to average every 3 values of an vector in Matlab, and then assign the average to the elements that produced it.

Examples:

x=[1:12];
y=%T         


        

Answer 1

You may find the mean of each trio using:

x = 1:12;
m = mean(reshape(x, 3, []));

To duplicate the mean and reshape to match the original vector size, use:

y = m(ones(3,1), :) % duplicates row vector 3 times
y = y(:)'; % vector representation of array using linear indices