Description
Subtract beforeCount from afterCount for delta, returning positive delta as insertedCount and positive negative-delta magnitude as removedCount.
A set contains distinct values, so duplicate input items do not contribute additional members. Ordered output is a serialization convention; membership, equality, and the chosen universe determine the underlying set result.
Subtract beforeCount from afterCount for delta, returning positive delta as insertedCount and positive negative-delta magnitude as removedCount.
When to use this tool
Use Multiset Item Count Delta when you need a deterministic operation on explicitly supplied sets or a finite membership representation.
How to use the tool and how it works
- Enter beforeCount, afterCount. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read delta, insertedCount, removedCount. Use the output convention below.
Subtract beforeCount from afterCount for delta, returning positive delta as insertedCount and positive negative-delta magnitude as removedCount.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| beforeCount | Before Count | Required. Safe integer; minimum 0. |
| afterCount | After Count | Required. Safe integer; minimum 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| delta | Delta | Required. Safe integer. |
| insertedCount | Inserted Count | Required. Safe integer. |
| removedCount | Removed Count | Required. Safe integer. |
{
"input": {
"beforeCount": 3,
"afterCount": 7
},
"output": {
"delta": 4,
"insertedCount": 4,
"removedCount": 0
}
}Limitations and assumptions
- Counts are nonnegative safe integers; equal totals cannot reveal simultaneous insertions and removals or item identity changes.
- 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
Specify the universe and equality convention before combining this result with other set operations.
References
Similar or alternative tools
- Finite Set Cardinality Update
Choose delta +1 or zero for insertion according to alreadyPresent, and -1 or zero for removal.
- List Adjacent Equality Mask
Return false at the first item and exact equality with the preceding item at every later position.