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5.9 NATURAL LOGARITHM Instruction (LN)

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5.9 NATURAL LOGARITHM Instruction (LN)

[Outline]

The LN instruction uses the Source as the input (x) and stores the natural logarithm (Log

) of the

input in the Dest as the operation result. This instruction can be used only in a real number operation.

[Format]

Symbol : LN

Full Name : Natural Logarithm

Category : FUNCTION

Icon :

[Parameter]

Parameter Name Setting

Source

(Input)

· Any real number type register

· Any real number type register with subscript

· Constant

Dest

(Output)

· Any real number type register (except for # and C register)

· Any real number type register with subscript (except for # and C register)

[Program Example]

The natural logarithm of the input value (x = 10.0) [Log

(x) = 2.3026] is calculated.

Notes: LN instruction is input(x) value is checked, execute the following handling.

· When the input is minus LN (-1), calculate a absolute value

· When the input is zero LN (0), take -∞ for solution.

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