FHIRPath Function: log

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Returns the logarithm base base of the input number. {:.stu}

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

If the input is 0 or negative, the evaluation will end and signal an error to the calling environment. If the base argument is 0 or negative, the evaluation will end and signal an error to the calling environment. {:.stu}

If base is empty, the result is empty. {:.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}

16.log(2) // 4.0
100.0.log(10.0) // 2.0

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Summary

• Category: Math
• Section: 5.8.6
• Return Type: Decimal
• Empty Input Result: empty
• Errors on Multiple Input: true

Description

Returns the logarithm base base of the input number.

Arguments

• base: Decimal - Base of the logarithm

Type Mapping

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

Example

16.log(2) // 4.0
100.0.log(10.0) // 2.0