Support for square root
Steve Ray (CMU)
Seeing the release of TopBraid 5.1.4 reminded me that I would like to suggest the addition of the square root function to your standard library of math functions. I know others have bumped into this omission.
In the meantime, I went ahead and defined it with the following code:
rules:sqrt
rdf:type spin:Function ;
spin:constraint [
rdf:type spl:Argument ;
spl:predicate sp:arg1 ;
] ;
spin:returnType xsd:float ;
spinx:javaScriptCode "return Math.sqrt (arg1)"^^xsd:string ;
rdfs:comment "Compute the square root of a number."^^xsd:string ;
rdfs:subClassOf spin:Functions ;
…which requires importing http://spinrdf.org/spinx (from /TopBraid/SPIN/spinx.ttl)
I know it’s easy for users to just do this, but many people may not want to figure out how to bring in javascript snippets and locate the Math library.
Of course, you would use a different prefix than “rules” which I did.
- Steve
Steven R. Ray, Ph.D.
Distinguished Research Fellow
Carnegie Mellon University
NASA Research Park
Building 23 (MS 23-11)
P.O. Box 1
Moffett Field, CA 94305-0001
Email: stev...@sv.cmu.edu
Phone: (650) 587-3780
Cell: (202) 316-6481
Skype: steverayconsulting
Pat Doyle
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Holger Knublauch
Jena already includes a number of math functions including afn:sqrt(num), see
http://jena.apache.org/documentation/query/library-function.html
These functions are not however listed in the afn namespace as instances of spin:Function and therefore do not show up in auto-complete etc.
Andy also updated me that Jena 3 (with TopBraid 5.2) will include the math functions from
https://www.w3.org/TR/xpath-functions-31/
Thanks
Holger
--
Steve Ray
Thanks, Holger,
That’s good to know.
Generally, when I’m looking for functions to use, I refer to the “TopBraid SPARQL Functions reference” section in TBC Help.
Updating that with either the new afn: functions, or a link to http://jena.apache.org/documentation/query/library-function.html in the help file would be a good way for users to know what is available.
- Steve
Steven R. Ray, Ph.D.
Distinguished Research Fellow
Carnegie Mellon University
NASA Research Park
Building 23 (MS 23-11)
P.O. Box 1
Moffett Field, CA 94305-0001
Email: stev...@sv.cmu.edu
Phone: (650) 587-3780
Cell: (202) 316-6481
Skype: steverayconsulting
