Description
Count consecutive missing observations ending at a selected step.
Control terms depend on error sign, units, sample timing, saturation direction and state conventions. Hysteresis retains state between thresholds, while deadband mapping and output clamping describe different operations. A negative loop-sign product or small scalar derivative does not establish closed-loop stability or safe operation.
Count consecutive missing observations ending at a selected step.
When to use this tool
Use Sensor Dropout Time Step Flag when you already have observed, stepIndex and need to count consecutive missing observations ending at a selected step.
How to use the tool and how it works
- Enter observed, stepIndex. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read dropout, consecutiveMissingThroughStep. Inspect dropout before interpreting the associated values.
Require a safe zero-based stepIndex within observed; dropout=!observed[index]. Walk backward through false flags until a true flag or the start and return that run length.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| observed | Observed | Required. Array of boolean; maximum items 256. |
| stepIndex | Safe zero-based index into a nonempty observed list. | Required. Safe integer; minimum 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| dropout | Dropout | Required. Boolean. |
| consecutiveMissingThroughStep | Backward false-run length ending at the selected step, not seconds or total missing count. | Required. Safe integer. |
{
"input": {
"observed": [
true,
false,
false,
true
],
"stepIndex": 2
},
"output": {
"dropout": true,
"consecutiveMissingThroughStep": 2
}
}Limitations and assumptions
- A true selected flag gives zero missing length. No sensor samples, elapsed duration, dropout cause, interpolation or safe response is determined.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Use a complete plant, controller, actuator and timing model with verified operating constraints for control decisions. Check interactions among saturation, integrator state, gains and delays; individual algebraic terms do not tune a controller or validate system stability or safety.
References
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