Re: Maths functions in a stylesheet?

Derek Hohls wrote:

> If any XSLT gurus could help with  this...
>
> I have a "maths functions" stylesheet, adapted from another source -
>
> <?xml version="1.0"?> 
> <xsl:stylesheet 
> xmlns:xsl="http://www.w3.org/1999/XSL/Transform";;
> xmlns:xalan="http://xml.apache.org/xalan";;
> xmlns:maths="http://www.mydomain.com/maths";;
> extension-element-prefixes="maths"
> version="1.0">
> <xalan:component prefix="maths" elements="rules" functions="sine cosine
> abs pi">
> <xalan:script lang="javascript">         
>   function sine(thisValue) {
>     return Math.sin(thisValue);
>   }
>   function cosine(thisValue) {
>     return Math.cos(thisValue);
>   }
>   function abs(thisValue) {
>     return Math.abs(thisValue);
>   }   
>   function pi() {
>     return 3.141592653589790;
>   }                             
> </xalan:script>
> </xalan:component>
> </xsl:stylesheet>
>
> Called like this:
>
> <?xml version="1.0"?>
> <xsl:stylesheet 
> version="1.0"
> xmlns:xsl="http://www.w3.org/1999/XSL/Transform";;
> xmlns:xalan="http://xml.apache.org/xalan";;
> xmlns:maths="http://www.mydomain.com/maths";;
> extension-element-prefixes="maths"> 
> >
> <xsl:include href="functions.xsl"/>  
> <xsl:template match="/">
> <xsl:variable name="foo" select="maths:pi()" />
> </xsl:template>
> </xsl:stylesheet>
>
> I get :
>
> An Error Occurred
> java.lang.RuntimeException: Unknown error in XPath.
> cause: java.lang.RuntimeException: Unknown error in XPath.
>
> when running this with Cocoon 2.1.5 (withe default build with Xalan).
>
> Thanks
> Derek
>
>  
Hi Derek,

could you just use http://www.exslt.org/math/, these are supported by 
the xalan processor
http://xml.apache.org/xalan-j/apidocs/org/apache/xalan/lib/ExsltMath.html

and include the constant PI.

<xsl:stylesheet version="1.0" 
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
 xmlns:math="http://exslt.org/math";

>

<xsl:template match="value">
   <xsl:value-of select="math:cos(.)"/>
</xsl:template>
</xsl:stylesheet>

Norman

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