Description
Calculate one shortest signed wrapped-angle increment.
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.
Calculate one shortest signed wrapped-angle increment.
When to use this tool
Use Joint Angle Unwrapping Increment when you already have previousWrappedDegrees, currentWrappedDegrees and need to calculate one shortest signed wrapped-angle increment.
How to use the tool and how it works
- Enter previousWrappedDegrees, currentWrappedDegrees. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read shortestIncrementDegrees. Use the output convention below.
Reduce each angle modulo 360 and wrap current-previous into [-180,180), so a half-turn tie gives -180.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| previousWrappedDegrees | Previous Wrapped Degrees | Required. Finite number. |
| currentWrappedDegrees | Current Wrapped Degrees | Required. Finite number. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| shortestIncrementDegrees | Current-previous representative in [-180,180); a half-turn maps to -180 and changes above 180 degrees can alias. | Required. Finite number. |
{
"input": {
"previousWrappedDegrees": 170,
"currentWrappedDegrees": -170
},
"output": {
"shortestIncrementDegrees": 20
}
}Limitations and assumptions
- This is one increment, not a full unwrapped trajectory. It cannot recover rotations larger than a half turn between samples or infer actual joint motion or clinical meaning.
- 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
- Stride Normalized Time Percent
Normalize a supplied sample time to a stride percentage.
- Gait Toe Heel Distance Projection
Project supplied heel-to-toe displacement onto an almost-unit forward axis.