MATLAB: How to calculate Cycles

Question

Hi,

I have data, want to calculate cycles after each reset of lifetime(each cycle life hours are different),

lifeHours
0.2
3
12
18
22
0.8
1.5
2.9
5
8
11
17
1
4
5
8
13
17
23
28

Desired Output: Cycles start from 1

Cycles
  1
  1
  1
  1
  1
  2
  2
  2
  2
  2
  2
  2
  3
  3
  3
  3
  3
  3
  3
  3

Many thanks in advance,

Answer 1

If you have R2015 or later, you can use the repelem (link) function.

Defining ‘v’ as your vector:

[~,locs] = findpeaks(-v);                           % Find Minima
tlocs = [1; locs; numel(v)+1];                      % Define Cycle Limits
dlocs = diff(tlocs);                                % Cycle Lengths
Output = repelem([1 2 3], dlocs)';                  % Vector Of Cycle Designations (R2015a & Later)
Cycles = [v Output]
Cycles =
          0.2            1
            3            1
           12            1
           18            1
           22            1
          0.8            2
          1.5            2
          2.9            2
            5            2
            8            2
           11            2
           17            2
            1            3
            4            3
            5            3
            8            3
           13            3
           17            3
           23            3
           28            3