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Article : Requirement Progression in Problem Frames

Home » Forums » Discussion » Modeling Idioms
 
Posted on: Wed, 03/04/2009 - 02:42
Jean-François
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Joined: 2008-11-17
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Article : Requirement Progression in Problem Frames
In the article "Requirement Progression in Problem Frames: Deriving Specifications from Requirements", a function odd[NGPulse, t] is mentionned (p9) "that determines the parity of the number of occurrences of the given phenomenon up to the given time". In fact NGPulse is a predicate:             pred NGpulse[t: Time] {t in NGP}
I haven't found a satisfying way to implement the function odd in Alloy.
Thank you for help.

JF Molderez
Senior Analyst
 
Posted on: Wed, 06/03/2009 - 07:06    #1
rseater
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Joined: 2008-01-24
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I didn't find a good way to encode that, actually.  I just hard-coded what all the odd-numbers were in my scope inside a predicate.

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