Hey Holger,
I did finally get it to work, but not in the way I thought I would (or how
I understood the documentation).
My steps:
1. Imported math.js into workspace
2. Created myFunctions.js. In this file I make a direct call to
Math.sqrt(x)
function mysquare(x)
{ return x * x; }
function myadd(x, y)
{ return x + y; }
function mysqrt(x)
{ return Math.sqrt(x) }
3. Created ex:mysqrt spin function (subclass of spin:Functions)
4. Within the ex:mysqrt spin function, I used the spinx:javascriptFile to
call the myFunctions.js
ex:mysqrt
rdf:type spin:Function ;
spin:returnType xsd:float ;
<http://spinrdf.org/spinx#javaScriptFile> "spinx:myFunctions.js" ;
rdfs:subClassOf spin:Functions ;
.
5. This allowed me to do the sparql bind:
BIND (ex:mysqrt(?x, 10) as ?mysqrt) .
Just wondering...do you have a time frame on TBC 5.4? The shacl-js looks
like where I want to go.
Thanks!
Michael
On Tuesday, August 29, 2017 at 7:31:30 PM UTC-4, Holger Knublauch wrote:
>
> Hi Michael,
>
> in order to debug this best, could you send me all relevant files in the
> same set up as you have them? (Off-list). I would otherwise need to
> speculate and we'll have multiple back-and-forth emails.
>
> In any case, the value spinx:math.js doesn't look like a correct file
> name. And you may want to try setting spinx:javaScriptCode instead of
> relying on the same-local-name policy. Defining the functions through some
> factory is going to complicate the situation, so better call them directly.
>
> Reference: http://spinrdf.org/spinx.html
>
> FWIW, from 5.4 onwards I'll recommend switching to SHACL-JS for
> user-defined functions.
>
> Holger
>
>
> On 30/08/2017 1:40, Michael Johnson wrote:
>
> All,
> I am trying to call the sqrt() function from the math.js library.
> I have successfully created my own .js files and called functions with
> those, however calling functions from math.js seems to be a bit different
>
> The math.js file is in my workspace.
>
> I have created different subclasses to spin:Functions called:
> ex:math.sqrt
> ex:sqrt
> ex:_sqrtNumber
>
>
> For example, in my ontology is the definition for sqrt:
> ex:sqrt
> rdf:type spin:Function ;
> spin:constraint [
> rdf:type spl:Argument ;
> spl:predicate sp:arg1 ;
> spl:valueType rdfs:Literal ;
> rdfs:comment "The number to compute the square root of." ;
> ] ;
> spin:returnType xsd:float ;
> <http://spinrdf.org/spinx#javaScriptFile>
> <http://spinrdf.org/spinx#javaScriptFile> "spinx:math.js" ;
> rdfs:subClassOf spin:Functions ;
> .
>
>
> I am trying to do a bind in my sparql - none of which work....
> BIND (ex:math.sqrt(10) as ?root ).
> BIND (ex:_sqrtNumber (9) as ?sqrt) .
> BIND (ex:sqrt(9) as ?sqrt2) .
>
> The actual function in the math.js file looks something like this:
>
> function factory (type, config, load, typed) {
> /**
> * Calculate the square root of a value.
> *
> * For matrices, the function is evaluated element wise.
> *
> * Syntax:
> *
> * math.sqrt(x)
> *
> * Examples:
> *
> * math.sqrt(25); // returns 5
> * math.square(5); // returns 25
> * math.sqrt(-4); // returns Complex 2i
> *
> * See also:
> *
> * square, multiply, cube, cbrt
> *
> * @param {number | BigNumber | Complex | Array | Matrix | Unit} x
> * Value for which to calculate the square root.
> * @return {number | BigNumber | Complex | Array | Matrix | Unit}
> * Returns the square root of `x`
> */
> var sqrt = typed('sqrt', {
> 'number': _sqrtNumber,
>
> 'Complex': function (x) {
> return x.sqrt();
> },
>
> With a private function below:
>
> /**
> * Calculate sqrt for a number
> * @param {number} x
> * @returns {number | Complex} Returns the square root of x
> * @private
> */
> function _sqrtNumber(x) {
> if (x >= 0 || config.predictable) {
> return Math.sqrt(x);
> }
> else {
> return new type.Complex(x, 0).sqrt();
> }
> }
>
> How can I successfully call the sqrt() function?
> I hope to be able to do the same with additional functions.
>
> Thanks,
> Michael
>
>
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