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Posted to dev@jena.apache.org by rvesse <gi...@git.apache.org> on 2017/02/02 10:18:09 UTC

[GitHub] jena issue #205: JENA-1277: don't use sorting in spatial queries, for much b...

Github user rvesse commented on the issue:

    https://github.com/apache/jena/pull/205
  
    We should already have support for most of the trigonometric functions built into ARQ as extension functions - https://github.com/apache/jena/tree/59e5e06c85c98c9c65a9c1addbc4252626e9d061/jena-arq/src/main/java/org/apache/jena/sparql/function/library/leviathan
    
    For example:
    
    ```
    sparql --data ~/Documents/Work/Datasets/minimal.nt "SELECT (<http://www.dotnetrdf.org/leviathan#sin>(90) AS ?x) { }"
    ------------------------
    | x                    |
    ========================
    | 0.8939966636005579e0 |
    ------------------------
    ```
    
    Notes:
    
    - Inverse functions are named as `sin-1` etc.
    - function arguments are expected to be radians
    - convenience functions `degreesToRadians` and `radiansToDegrees` are provided


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