Returns the e-based logarithm (the natural logarithm) of a value a, i.e. elog(a).
Syntax
LN(Value)
Input
Value | is a value |
Domain type: | any Value domain |
Value range: | >0 |
Output
LN returns: | a real value |
Domain: | system domain Value |
Notes:
Tip:
When the definition symbol = is used, a dependent output map or dependent output column is created; when the assignment symbol := is used, the dependency link is immediately broken after the output map/column has been calculated.
Usable in
MapCalc, TabCalc, Simple calculators
Examples
Pocket line calculator examples:
? LN(2.7183) |
returns 1.0000 |
? LN(20) | returns 2.9957 |
? LN(EXP(4)) | returns 4.0000 |
MapCalc example:
OutMap = LN(InMap)
InMap |
OutMap |
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|
|
TabCalc example:
OutCol = LN(InCol)
InCol |
OutCol |
7.3891 |
2.0 |
2.7183 |
1.0 |
1.6487 |
0.5 |
1.2214 |
0.2 |
1.0000 |
0.0 |
0.3679 |
-1.0 |
? |
? |
0.6703 |
-0.4 |
0.9048 |
2.3062 |
See also: