MATLAB: Calculates the mean if the difference of two or more number is 1

Question

Hi all;

I want to calculate mean of numbers if their difference with its neighbor is 1 . For example, if I have a matrix:

A = [9 10 12 14 15 16 18 19 22 23 25];

For each number whose difference with the neighbors is one, their mean is calculated. So, the intended result (called as matrix B):

B [9.5 12 15 18.5 22.5 25];

I try to use:

diff(A), so we get

1 2 2 1 1 2 1 3 1 2

But, how to use this diff(A) to do an operation , so that we get the resul: B [9.5 12 15 18.5 22.5 25];

Thank you for help.

Answer 1

A = [9 10 12 14 15 16 18 19 22 23 25];
idx = find(diff(A)==1);
B = mean([A(idx);A(idx+1)])

I think you have a typo above, 25 would not be in the final array:

B =
    9.5000   14.5000   15.5000   18.5000   22.5000
    

Could also:

mv = movmean(A,2);
idx = find(diff(A)==1);
B = mv(idx+1)