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Found 4 results

1. ## Create a Condition Each Time Value Changes

I have a step signal that is either always 0 or 1 (Boolean). I need to create a signal every time this value changes. Any tips to help me out here? Thanks in advance.
2. ## Identify subtle trends or step changes in a signal

Background: When looking to identify trends or step changes in a signal, we typically recommend an approach of smoothing the signal, taking the first derivative, then identifying when that derivative is positive or negative. This method works well most of the time, but employing this technique in combination with others can be more effective at capturing trends/step changes when the value change in the signal is more subtle. Solution: When looking for step changes, we can use a technique of calculating a range of the signal on a rolling periodic basis and search for when the r
3. ## Incorrect derivative result

FAQ: Why does the derivative look funny? When taking a derivative and the result looks like the screenshot below, but a smoother signal is expected it is likely that the input signal is step interpolated. To verify this, click on the item properties “I” on the input signal and check the interpolation method. Item Properties View The interpolation method can be corrected by simply adding toLinear() in front of the derivative. See screen shot below of the formula. Final Results
4. ## Comparing start and end values during an event

FAQ: I want to identify the change in value of my signal after a change has occurred. My signal is generally constant (with typical noise) aside from when an event occurs during which there is a step change in the value of the signal. Solution: In order to compare the actual value of the signal before and after some event, you must first identify the event. Method 1: Running Delta. Note: an approach using the running delta function can be preferred to the derivative function (Method 2) when step changes are present as the derivative is infinite during these steps. Using the
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