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# LogiView

## Function 'ln'

| This function returns the result of the natural logarithm (reverse function for the natural exponential function 'exp').
| ### Syntax:
| {INT_VAR|FLO_VAR}= ln({NUM_EXPR})
| ### I/O parameters:
| {NUM_EXPR} | Value to be calculated.
| - |
| ### Return value:
| {INT_VAR|FLO_VAR} | Integer or float value containing the result of this function.
| ### Example:
| Declaration of Variables
     10 ask(DOCU_FLOAT_1,"Please enter a value!")
     20 DOCU_FLOAT_2 = ln(DOCU_FLOAT_1)
     30 put(DOCU_FLOAT_2)
| Result: (For DOCU_FLOAT_1 = 1,2)
| In order to prevent errors, the float/double type must be used if results can be expected to be either very large or very small (<2^-31 or > 2^31).
| Functions and commands: Mathematics