# How to calculate Cycles

39 views (last 30 days)
Mekala balaji on 22 Feb 2018
Commented: Mekala balaji on 23 Feb 2018
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,

#### 1 Comment

Mekala balaji on 23 Feb 2018
Sir Thanks, it works

Star Strider on 22 Feb 2018
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

### More Answers (1)

Pawel Jastrzebski on 22 Feb 2018
Edited: Pawel Jastrzebski on 22 Feb 2018
Consider the following code:
data = [0.2 3 12 18 22 0.8 1.5 2.9 8 11 17 1 4 5 8 13 17 23 28]'
% preallocation
cycle(length(data),1) = 0
% manually mark a beginning of the first cycle
cycle(1) = 1;
for i=2:length(data)
if data(i)>data(i-1)
cycle(i) = cycle(i-1);
else
cycle(i) = cycle(i-1)+1;
end
end
cycle
The output:
>> cycle
cycle =
1
1
1
1
1
2
2
2
2
2
2
3
3
3
3
3
3
3
3

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