isNan (Function)
This function wraps the java.lang.Float.isNaN() and java.lang.Double.isNaN() functions and returns true if p1 is NaN (Not-a-Number), and returns false if otherwise.
Syntax
<BOOL> math:isNan(<FLOAT|DOUBLE> p1)
Query Parameters
| Name | Description | Default Value | Possible Data Types | Optional | Dynamic |
|---|---|---|---|---|---|
| p1 | The value of the parameter which the function determines to be either NaN or a number. | FLOAT DOUBLE | No | Yes |
Example 1
CREATE STREAM InValueStream (inValue1 double, inValue2 int);
@info(name = 'checkNaN')
INSERT INTO OutMediationStream
SELECT math:isNan(inValue1) AS isNaN
FROM InValueStream;
The query checks if the given inValue1 from the InValueStream is an undefined value (NaN). If it is, the function returns true. The result is directed to the output stream OutMediationStream. For example, isNan(java.lang.Math.log(-12d)) returns true.