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Returns the natural logarithm of X.

Same as LOG( X, 2.718282 ).

Units: LN(dimensionless) --> dimensionless (the argument must be dimensionless)

Examples

LN( 2.718282 ) is equal to 1.0.

LN( -5.0 ) causes an error (LN of a number <= 0 is not defined).

LN( EXP(2.0)) is equal to 2.0 (by definition).

See also: LOG, EXP, POWER.

Sample model: EXP + LN + LOG.mdl in FunctionExamples