Extracting the data after the threshold point

Hi everybody,

I am looking for extracting series of data after a threshold.

I have set the threshold at 1.4 and looking to extract the data after(data from x axis).

X axis is number of cycle

y axis is capacity

Kindly suggest an approach or link for reference, hope my question is understandable.

[Image Analyst]

So do you want data starting with x=118 or 120? If the threshold is 1.4, why are there are few red dots before y ever gets down to 1.4, as if you wanted to select those?

[Jennifer Arputharaj]

Hi,

I divided the training set to 0.7 (numTimeStepsTrain = floor(0.7*numel(data));) as i am working on remaining useful life.

Can I change the above code by dividing the training set from the capacity 1.4 ?

Answer 1

[Star Strider]

If I understand correctly what you want to do, this will work:

Capacity_Thresh = Capacity(Capacity <= 1.4);
NrCycles_Thresh = Number_Of_Cycles(Capacity <= 1.4);

This will detect and save only those values where ‘Capacity’ is less than or equal to ‘Threshold’. If you want to detect the first index that ‘Capacity’ is less than or equal to ‘Threshold’, and save everything after that:

Thrsh1 = find(Capacity <= 1.4, 1);
Capacity_Thresh = Capacity(Thrsh1:end);
NrCycles_Thresh = Number_Of_Cycles(Thrsh1:end);

You may need to experiment to get the result you want.

[Jennifer Arputharaj]

Thank you for the reply, really appreciate it.

[Star Strider]

As always, my pleasure.