How to calculate the mean of 5 columns in a 12x80x250 array?

Hello all, I have a newbie question: I have a 12x80x250 multidimensional array (12 rows, 80 columns, 250 "pages"). What I have to do is to create an 81th column which corresponds to the mean of the columns 8,13,27,45,52. I created a new variable which keeps the first and the third dimension constant and extracts only my 5 columns of interest:

Q=Array(:,([8 13 27 45 52]),:);

Now I have the Q variable which is a 12x5x250 array. In the next step I would like to "squeeze" the 5 columns into a single one containing the average values across them. Then the final step would be to embed this new column into my initial array.Thanks

Answer 1

[the cyclist]

Q=Array(:,([8 13 27 45 52]),:);

QMean = mean(Q,2);

ArrayAndQMean = cat(2,Array,QMean);

You could do it all in a one-liner:

ArrayAndQMean = cat(2,Array,mean(Array(:,([8 13 27 45 52]),:),2));

[mimmo voso]

Thank you very much!