Topic: DMD0103

LN - Natural Log

This instruction can only be used in the Expression parameter of the Calculate Expression (MATH) instruction.

The Natural Log (LN) function will compute the natural log (Log Base e) of the function expression.

The expression parameter consists of all the text between the bounding parentheses. Any expression parameter can be a constant value, a bit or numeric memory location, an arithmetic expression, and/or mathematical function or other expressions up to a maximum of 1024 characters. Expressions can be nested, so use of parentheses is recommended to ensure proper evaluation order.

The range of acceptable input values is any positive integer or real number.

Some examples:

LN( E() ) = 1.0

LN( SQRT( E() ) ) = 0.5

The result is always a real value even if the input parameter is an integer

See Also:

• LN - Natural Log

• LOG - Log Base 10
   

• SQRT - Square Root

• ** - Raise to Power

Related Topics:

• MATH - Calculate Expression

Rung Example: