Description
Return drift-adjusted displacement and its share.
Diffusive and thermal scales depend on dimensionality, geometry, drag and compatible energy/time units. A local displacement correction or ideal spherical diffusivity is distinct from fitting a stochastic trajectory or establishing that a measured system satisfies the model.
Return drift-adjusted displacement and its share.
When to use this tool
Use Molecular Step Drift Share when checking the stated diffusion, drift, work or thermal-energy convention.
How to use the tool and how it works
- Enter observedStep, suppliedDrift, elapsedTime. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read driftStep, correctedStep, driftShare, defined. Inspect defined before interpreting the associated values.
Return drift-adjusted displacement and its share. Require elapsedTime >= 0; driftStep = suppliedDrift*elapsedTime, correctedStep = observedStep-driftStep; driftShare divides by observedStep or is zero with defined false.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| observedStep | Observed Step | Required. Finite number. |
| suppliedDrift | Supplied Drift | Required. Finite number. |
| elapsedTime | Elapsed Time | Required. Finite number; minimum 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| driftStep | Drift Step | Required. Finite number. |
| correctedStep | Corrected Step | Required. Finite number. |
| driftShare | Signed driftStep/observedStep, or zero placeholder when defined=false. | Required. Finite number. |
| defined | Whether the stated denominator or information basis supports this value; inspect placeholders before interpretation. | Required. Boolean. |
{
"input": {
"observedStep": 10,
"suppliedDrift": 2,
"elapsedTime": 2
},
"output": {
"driftStep": 4,
"correctedStep": 6,
"driftShare": 0.4,
"defined": true
}
}Limitations and assumptions
- Supplied drift is not estimated; signed shares can exceed one, and zero observed displacement gives a placeholder.
- 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 trajectories and an appropriate geometry/noise/transport model for fitted diffusion parameters, uncertainty or molecular mechanisms.
References
Similar or alternative tools
- Trajectory Localization Variance Factor
Subtract localization noise from measured mean-square displacement.
- Marker Velocity Central Difference Term
Return a central-difference marker velocity.