Description
Return first/second and first-minus-second.
A pattern's seam and closure dimensions combine finished lengths with allowances, overlaps and offsets. A local length budget describes an ideal construction; fabric thickness, movement and fitting can change the practical result.
Return first/second and first-minus-second.
When to use this tool
Use Princess Seam Notch Interval Ratio when you need a local pattern, seam or closure dimension check.
How to use the tool and how it works
- Enter firstInterval, secondInterval. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read ratio, difference. Use the output convention below.
Require nonnegative first interval and positive second interval. Return first/second and first-minus-second.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| firstInterval | First Interval | Required. Finite number; minimum 0. |
| secondInterval | Second Interval | Required. Finite number; strictly above 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| ratio | Dimensionless ratio under the numerator/denominator convention above. | Required. Finite number. |
| difference | Difference | Required. Finite number. |
{
"input": {
"firstInterval": 12,
"secondInterval": 10
},
"output": {
"ratio": 1.2,
"difference": 2
}
}Limitations and assumptions
- The interval direction and notch correspondence are caller supplied. Matching ratios do not validate full seam geometry or fit.
- 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
Check the complete pattern and make an appropriate sample in the intended material. Review seam construction, allowances, shrinkage and fitting rather than treating one margin as complete garment validation.
References
Similar or alternative tools
- Pattern Notch Relative Position
Return direct normalized position/distance, or their complements when reverseDirection.
- Dart Leg Length Residual
Return firstLeg-minus-secondLeg.