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Computes the positive or negative sign of a given numeric value. The value can be a Decimal or Integer literal, a function returning Decimal or Integer, or a reference to a column containing numeric values.
- For positive values, this function returns
1. - For negative values, this function returns
-1. - For the value
0, this function returns0.
Wrangle vs. SQL: This function is part of Wrangle, a proprietary data transformation language. Wrangle is not SQL. For more information, see Wrangle Language.
Basic Usage
Column reference example:
sign(MyInteger)
Output: Returns the sign of the value found in the MyInteger column.
Numeric literal example:
(sign(MyInteger) == -1)
Output: Returns true if the sign of the entry in the MyInteger column is -1.
Syntax and Arguments
sign(numeric_value)
| Argument | Required? | Data Type | Description |
|---|---|---|---|
| numeric_value | Y | Decimal or Integer | Decimal or Integer literal, function returning Decimal or Integer, or name of column to apply to the function |
For more information on syntax standards, see Language Documentation Syntax Notes.
numeric_value
Numeric literal, function returning numeric literal, or name of the column containg values the sign of which are to be computed.
- Missing input values generate missing results.
- Literal numeric values should not be quoted. Quoted values are treated as strings.
- Multiple columns and wildcards are not supported.
Usage Notes:
| Required? | Data Type | Example Value |
|---|---|---|
| Yes | String (column reference) or Integer or Decimal value | -10.5 |
Tip: For additional examples, see Common Tasks.
Examples
Example - Basic SIGN function
Source:
Your source data looks like the following, which measures coordinate distances from a fixed point on a grid:
| X | Y |
|---|---|
| -2 | 4 |
| -6.2 | -2 |
| 0 | -4.2 |
| 4 | 4 |
| 15 | -0.05 |
Transformation:
You can use the following transform to derive the sign values of these columns:
| Transformation Name | New formula |
|---|---|
| Parameter: Formula type | Single row formula |
| Parameter: Formula | sign(X) |
| Parameter: New column name | 'signX' |
| Transformation Name | New formula |
|---|---|
| Parameter: Formula type | Single row formula |
| Parameter: Formula | sign(Y) |
| Parameter: New column name | 'signY' |
Using these two columns, you can assign each set of coordinates into a quadrant. For ease of reading, the following has been broken into two separate tranformations:
| Transformation Name | Conditional column |
|---|---|
| Parameter: Condition type | Case on custom conditions |
| Parameter: Case 01 - Condition | (signX == 1) && (signY == -1) |
| Parameter: Case 01 - Value | 'lower-right' |
| Parameter: Case 02 - Condition | (signX == 1) && (signY == 1) |
| Parameter: Case 02 - Value | 'upper-right' |
| Parameter: Default value | 'line' |
| Parameter: New column name | 'q1' |
| Transformation Name | Conditional column |
|---|---|
| Parameter: Condition type | Case on custom conditions |
| Parameter: Case 01 - Condition | (signX == -1) && (signY == -1) |
| Parameter: Case 01 - Value | 'lower-left' |
| Parameter: Case 02 - Condition | (signX == -1) && (signY == 1) |
| Parameter: Case 02 - Value | 'upper-left' |
| Parameter: Default value | 'line' |
| Parameter: New column name | 'q2' |
Then, you can merge the two columns together:
| Transformation Name | Merge columns |
|---|---|
| Parameter: Columns | q1,q2 |
| Parameter: Separator | '' |
| Parameter: New column name | 'quadrant' |
Results:
| X | Y | signX | signY | quadrant |
|---|---|---|---|---|
| -2 | 4 | -1 | 1 | upper-left |
| -6.2 | -2 | -1 | -1 | lower-left |
| 0 | -4.2 | 0 | -1 | line |
| 4 | 4 | 1 | 1 | upper-right |
| 15 | -0.05 | 1 | -1 | lower-right |
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