FHIRPath Function: sqrt

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Returns the square root of the input number. {:.stu}

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

If the square root cannot be represented (such as the square root of -1), 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}

Note that this function is equivalent to raising a number of the power of 0.5 using the power() function. {:.stu}

81.sqrt() // 9.0
(-1).sqrt() // empty

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Summary

• Category: Math
• Section: 5.8.9
• Return Type: Decimal
• Empty Input Result: empty
• Errors on Multiple Input: true

Description

Returns the square root of the input number as a Decimal.

Arguments

• none

Type Mapping

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

Example

81.sqrt() // 9.0
(-1).sqrt() // empty