Map and Table Calculation

LN( ) function

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

7.3891 2.7183 1.6487
1.2214 1.0000 0.3679
? 0.6703 10
2.0 1.0 0.5
0.2 0.0 -1.0
? -0.4 2.3062

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: