What dimension do you want to concatenate along and how do you want to take the mean?
X = mean(cat(2,randn(10,2),randn(10,2)),2);
Forms a matrix that is 10x4 and then takes the means of the rows to yield a 10x1 vector.
X = mean(cat(1,randn(10,2),randn(10,2)),1);
Forms a matrix that is 20x2 and takes the means of the columns to yield a 1x2 vector.
Wayne
