| Excerpt |
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Computes the natural logarithm of an input value. The value can be a Decimal or Integer literal or a reference to a column containing numeric values. |
- The natural logarithm of a value is the value of e x such that is the input value.
Numeric literal example:
| D lang syntax |
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| RawWrangle | true |
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| Type | ref |
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| showNote | true |
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| WrangleText | derive type:single value: ln(10) |
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ln(10) |
Output: Returns the value X, such that e x, is 10. This value is approximately 2.302585092994046.
Column reference example:
| D lang syntax |
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| RawWrangle | true |
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| Type | ref |
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| showNote | true |
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| WrangleText | derive type:single value: ln(MyValue) as: 'ln_MyValue' |
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ln(MyValue) |
Output: Returns the power to which e is raised to yield the value in the MyValue column.
| D lang syntax |
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| RawWrangle | true |
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| Type | syntax |
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| showNote | true |
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| WrangleText | derive type:single value: ln(numeric_value) |
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ln(numeric_value) |
| Argument | Required? | Data Type | Description |
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| numeric_value | Y | string, decimal, or integer | Name of column or Decimal or Integer literal to apply to the function |
numeric_value
Name of the column or numeric literal, the natural logarithm of which is 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.
| Required? | Data Type | Example Value |
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| Yes | String (column reference) or Integer or Decimal literal | 10 |
Example - Exponential Functions
| Include Page |
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| EXAMPLE - Exponentional Functions |
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| EXAMPLE - Exponentional Functions |
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