Description
Normalize a supplied sample time to a stride percentage.
Movement geometry depends on coordinate registration, time origins, force signs and reference axes. A moment arm must already represent perpendicular leverage, a stride percentage has an endpoint convention, and a toe-to-heel projection differs from full Euclidean separation. Scalar results do not establish a movement diagnosis or a safe activity.
Normalize a supplied sample time to a stride percentage.
When to use this tool
Use Stride Normalized Time Percent when you already have sampleTimeSeconds, strideStartSeconds, strideEndSeconds and need to normalize a supplied sample time to a stride percentage.
How to use the tool and how it works
- Enter sampleTimeSeconds, strideStartSeconds, strideEndSeconds. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read stridePercent. Use the output convention below.
Require end>start and sample within both inclusive endpoints; return 100*(sample-start)/(end-start).1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| sampleTimeSeconds | Sample Time Seconds | Required. Finite number. |
| strideStartSeconds | Stride Start Seconds | Required. Finite number. |
| strideEndSeconds | Stride End Seconds | Required. Finite number. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| stridePercent | 100*(sampleTimeSeconds-strideStartSeconds)/(strideEndSeconds-strideStartSeconds), accepting 0 and 100. Rescale extreme clocks to preserve differences. | Required. Finite number. |
{
"input": {
"sampleTimeSeconds": 1.25,
"strideStartSeconds": 1,
"strideEndSeconds": 2
},
"output": {
"stridePercent": 25
}
}Limitations and assumptions
- Endpoints give nominal 0 and 100, not a periodic wrap. No gait event, stride validity or clinical conclusion is inferred. Rescale extreme timestamps to avoid intermediate overflow corrupting the percentage or causing rejection.
- 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 calibrated motion, force and timing records with a complete biomechanical model. Check coordinate frames, axis normalization and sampling limitations before interpreting local distances, moments or phase values as performance or clinical findings.
References
Similar or alternative tools
- Running Contact Flight Duty Factor
Calculate supplied contact and flight fractions of a positive cycle.
- Joint Angle Unwrapping Increment
Calculate one shortest signed wrapped-angle increment.