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Set Real to NaN [message #1838493]

Fri, 26 February 2021 11:39

Gunnar Arndt

Messages: 82
Registered: June 2012

Member

Is there a way to set Real values in the output model of an ATL transformation to 'Not a Number' (NaN) or other special floating point values, e.g. by dividing by zero?
Thanks.

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Re: Set Real to NaN [message #1838509 is a reply to message #1838493]

Fri, 26 February 2021 17:32

Dennis Wagelaar

Messages: 581
Registered: September 2012
Location: Belgium

Senior Member

ATL stores Reals as Java Double values, which support positive and negative Infinity, as well as NaN.

The following code prints "NaN":

query DivisionByZero = (0.0 / 0.0).debug();

The following code prints "Infinity":

query DivisionByZero = (5.0 / 0.0).debug();

The following code prints "-Infinity":

query DivisionByZero = (-5.0 / 0.0).debug();

Cheers,
Dennis

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Re: Set Real to NaN [message #1838622 is a reply to message #1838509]

Tue, 02 March 2021 15:45

Gunnar Arndt

Messages: 82
Registered: June 2012

Member

Cool, thanks again.

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