RE: tail recursion and NaN

Hi Susan,

If the operation is a simple sum, why not use the inherent XSLT function sum 
and let the XPath pick out the right nodes for you?
BTW a number(.) also returns 'NaN' if the node's string value is nothing 
(""), so some of the tests you do are not necessary anyway (MK's XSLT 
Programmers Ref. 2nd. ed., p. 532).
I would expect something like this to work:
result = <xsl:value-of 
select="sum(nodeset-containing-prices[number(translate(.,'$',''))!='NaN'])"/>
where nodeset-containing-prices should be exchanged with the nodeset you use 
in the $price parameter first time the template total_value is called.
I hope this helps

Regards,
Ragulf Pickaxe :)


> From: "Susan Campbell" <SCampbell(_at_)ccla(_dot_)lib(_dot_)fl(_dot_)us>
> Reply-To: xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com
> To: <xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com>
> Subject: RE: [xsl] tail recursion and NaN
> Date: Fri, 7 May 2004 08:59:19 -0400
>
> Thanks for the help.  I later learned I also had to test for a dollar sign 
> as well as empty cells.  This is what I'm using.  It works, but there may 
> be a more compact/elegant way to do it.
> sc
>
> <xsl:template name="total-value">
>    <xsl:param name="price"/>
>          <xsl:param name="result" select="0"/>
>          <xsl:param name="nodollarsign" select="translate($price,'$','')"/>
>            <xsl:choose>
>                 <xsl:when test="$price and number($price) = number($price)">
>                          <xsl:call-template name="total-value">
>                         <xsl:with-param name="price" select="$price[position() &gt; 
> 1]"/>
>                         <xsl:with-param name="result" select="$result + 
> $price"/>
>                         </xsl:call-template>
>                 </xsl:when>
>                 <xsl:when test="$nodollarsign">
>                         <xsl:call-template name="total-value">
>                         <xsl:with-param name="price" select="$price[position() &gt; 
> 1]"/>
>                         <xsl:with-param name="result" select="$result + 
> $nodollarsign"/>
>                             </xsl:call-template>
>                    </xsl:when>
>                 <xsl:when test="$price and number($price) != number($price)">
>                         <xsl:call-template name="total-value">
>                         <xsl:with-param name="price" select="$price[position() &gt; 
> 1]"/>
>                         <xsl:with-param name="result" select="$result"/>
>                         </xsl:call-template>
>                 </xsl:when>
>                 <xsl:otherwise><xsl:value-of select="$result"/></xsl:otherwise>
>          </xsl:choose>
> </xsl:template>
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