Matrix and Averaging problems

say I have a matrix V = 180x1 double.

STEP 1 = I need to make 15 matrices, 12x1 column each ( Say Jan to Dec)

STEP 2= I need to take the average of all the Januaries .. (First row of every matrix), then Februaries (First row of every matrix)..upto Dec

STEP 3= I need to do (Jan - avg of all the Januaries)... (Dec- avg of all the Decs) for all the matrices. I will have again 15 matrices (12x1)

Answer 1

[Atsushi Ueno]

V = rand(180,1);
step1 = reshape(V, [15 12]);
step2 = mean(step1);
step3 = step1 - step2;

[Joydeb Saha]

step1 should be = reshape(V, [12 15])

step 2 = mean of each row of all the matrices.

step 3= first element minus avg of all the first element and so on..

please help

[Atsushi Ueno]

Sorry, I misunderstood about step2. Step2 shall be 1*15 right?

V = rand(180,1);
step1 = reshape(V, [12 15]);
step2 = mean(step1);
step3 = step1 - step2;