FHIRPath Function: ln

{:.stu}

Returns the natural logarithm of the input (i.e. the logarithm base e). {:.stu}

Accepts Decimal input types. Integer and Long types are also accepted via implicit conversion to Decimal. {:.stu}

If the input collection is empty, the result is empty. {:.stu}

If the input collection contains multiple items, the evaluation of the expression will end and signal an error to the calling environment. {:.stu}

1.ln() // 0.0
1.0.ln() // 0.0

{:.stu}

Summary

• Category: Math
• Section: 5.8.5
• Return Type: Decimal
• Empty Input Result: empty
• Errors on Multiple Input: true

Description

Returns the natural logarithm of the input (i.e. the logarithm base e).

Arguments

• none

Type Mapping

• Integer-Decimal
• Long-Decimal
• Decimal-Decimal

Example

1.ln() // 0.0
1.0.ln() // 0.0