Tango Walk Beat Syncopation Checker

Audit actual tango footfall timing against caller score plus explicit permitted syncopation annotations; no normative tango rhythm or interpreting syncopation as poor technique.

Description

Footfall timing can be compared with a caller score while preserving permitted syncopation annotations.

Footfall timing can be compared with a caller score while preserving permitted syncopation annotations. Off-beat timing is not automatically an error.^[1]

Enter aligned nonempty nonnegative nondecreasing observed/expected beats and binary syncopation flags plus nonnegative tolerance. Return signed deviations, strict timing exceedance indexes and unannotated off-beat indexes.

When to use Tango Walk Beat Syncopation Checker

Use Tango Walk Beat Syncopation Checker when you need to evaluate the supplied records under the calculation and evidence rules below. No normative tango rhythm or technique assessment is inferred.

Prepare the annotated dance, timing, rehearsal or inventory records requested. Supply caller rules, evidence flags and local reference values; distinguish beats, bars, counts and seconds.

How to use Tango Walk Beat Syncopation Checker and understand its results

Prepare the annotated dance, timing, rehearsal or inventory records requested. Supply caller rules, evidence flags and local reference values; distinguish beats, bars, counts and seconds.
Enter observedTangoFootfallBeatPositions, callerExpectedTangoFootfallBeatPositions, callerBeatPositionTolerance, callerSyncopatedFootfallFlags using the field table and calculation rules, then run the tool.
Read signedFootfallBeatDeviations, footfallsOutsideCallerTimingIndices, unannotatedOffBeatFootfallIndices. The explanation below defines the units, signs, ordering and any flags or placeholder values.
If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.

Input field	Meaning	Value type; see rules below	Requirement
observedTangoFootfallBeatPositions	Observed tango footfall beat positions	list of number	Required
callerExpectedTangoFootfallBeatPositions	Caller expected tango footfall beat positions	list of number	Required
callerBeatPositionTolerance	Caller beat position tolerance	number	Required
callerSyncopatedFootfallFlags	Caller syncopated footfall flags	list of number	Required

deviation=observed−expected; offBeat=abs(observed−round(observed))>tolerance

Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.

Output field	Meaning	Value type
signedFootfallBeatDeviations	Signed footfall beat deviations	list of number
footfallsOutsideCallerTimingIndices	Footfalls outside caller timing indices	list of number
unannotatedOffBeatFootfallIndices	Unannotated off beat footfall indices	list of number

json

{
  "input": {
    "observedTangoFootfallBeatPositions": [
      0,
      1.5,
      2,
      3
    ],
    "callerExpectedTangoFootfallBeatPositions": [
      0,
      1,
      2,
      3
    ],
    "callerBeatPositionTolerance": 0.1,
    "callerSyncopatedFootfallFlags": [
      0,
      1,
      0,
      0
    ]
  },
  "output": {
    "signedFootfallBeatDeviations": [
      0,
      0.5,
      0,
      0
    ],
    "footfallsOutsideCallerTimingIndices": [
      1
    ],
    "unannotatedOffBeatFootfallIndices": []
  }
}

Limitations and assumptions

No normative tango rhythm or technique assessment is inferred.

Numeric inputs, where present, must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Numeric lists are limited to 10,000 entries; string lists to 128 strings of at most 128 characters each. The rules above may impose smaller limits. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.

Alternative or Complementary methods

Use Cha Cha Triple Step Count Placement: A cha-cha triple placement check compares three observed steps with caller subdivisions and an anchor. Style conventions remain explicit inputs. For a complementary task, use Accent On Off Beat Placement Counter: Accent phase can fall on a beat, at a caller off-beat phase or elsewhere. Disjoint tolerance windows avoid forced binary classification.

References

Tango Walk Beat Syncopation Checker — tool.io

Similar or alternative tools

Cha Cha Triple Step Count Placement
A cha-cha triple placement check compares three observed steps with caller subdivisions and an anchor. Style conventions remain explicit inputs.
Accent On Off Beat Placement Counter
Accent phase can fall on a beat, at a caller off-beat phase or elsewhere. Disjoint tolerance windows avoid forced binary classification.