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  • Seeq Team

FAQ:

I have a condition for events of variable duration. I would like to create a new condition that comprises the first third of the time (or 4th, or 10th) of the original condition. 

Solution:

A stepwise approach can be taken to achieve this functionality. 

1. Begin with your condition loaded in the display pane. 

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2. Create a new Signal using Signal from Condition that calculates the total duration of each of your event capsules, interpolated as a step signal. 

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3. Create a new signal that is your total event duration multiplied by the proportion of the event that you would like to capture. e.g. for the first 1/3 of the event, divide your total duration signal by 3, as shown below. 

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4. Create an arbitrary discrete signal with a sample at the start of each of your event capsules. 

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5. Shift the arbitrary discrete signal in time by the value of your signal calculated in step 3. In this example, the 1/3 duration signal. Note, depending on your version of Seeq, the function to do this may be called move() or delay(). 

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6. Use the toCapsules() function in Formula to create a tiny (zero duration) capsule at each of your shifted, discrete samples. 

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7. Join the start of your original condition with the capsules created in step 6 using the composite condition tool. 

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  • Seeq Team

For those Formula-savvy users, a one Formula approach to this would be as follows where you would define your percentage of the capsule in the first line:

$percent = 10%.tosignal().resample(1s)
$condition.transform($capsule ->{
$movetime = $capsule.duration()*$percent.toScalars($capsule).first()
capsule($capsule.startKey(),$capsule.startKey()+$movetime)})

 

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