Natural logarithm
The Natural logarithm step computes the mathematical natural logarithm (loge(x) or sometimes also ln(x)) of the values in the selected input column.
Parameters
-
Input column: a numeric column (decimal or integer).
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Target column: configure the column which will receive the output. Output will always be of decimal type.
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Write result to the current column: overwrite the input column with the result.
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Create new column with name: create a new column with specified name. Name of the new column can contain spaces or special characters - technical column name will be created automatically. The new column will be placed right after the input column.
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Examples
| Input value | Output value | Description |
|---|---|---|
1 |
0 |
|
1000000 |
13.8155105579 |
|
-2 |
Error |
Natural logarithm is not defined for negative numbers and results in an error. |
0 |
Error |
Natural logarithm is not defined for 0 and results in an error. |
No value |
Error |
No value input results in an error. |
Remarks
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Applying the step to No value cells (cells containing null) will result in an error.
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Natural logarithm step can only be applied to values greater than 0. Natural logarithm is not defined for zero or negative values and will return an error.
See also
-
logfunction in CTL.