RE: sum() function giving strange result

From: <Jarno.Elovirta@xxxxxxxxx>
Reply-To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
To: <xsl-list@xxxxxxxxxxxxxxxxxxxxxx>
Subject: RE:  sum() function giving strange result
Date: Tue, 14 Dec 2004 08:34:45 +0200

Hi,

> The sum funciton is giving some strange result.
>
> Xml :-
> <documents>
>   <value>10.11</value>
>   <value>20.22</value>
>   <value>30.33</value>
>   <value>40.44</value>
>   <value>50.55</value>
>   <value>10.11</value>
>   <value>20.22</value>
> </documents>
>
> XSL :-
> <?xml version="1.0" encoding="UTF-8"?>
> <xsl:stylesheet version="1.0"
> xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
> 	xmlns:exsl="urn:schemas-microsoft-com:xslt"
>                 extension-element-prefixes="exsl">
>
> <xsl:variable name="SubTotals">
>   <xsl:for-each  select="/documents/value">
>     <value><xsl:value-of select="." /></value>
>   </xsl:for-each>
> </xsl:variable>
>
> <xsl:template match="/">
>     <xsl:apply-templates select="documents/value" />
> </xsl:template>
>
> <xsl:template match="value">
>      <xsl:variable name="Position" select="position()" />
>      <xsl:value-of
> select="sum(exsl:node-set($SubTotals)/value[position()
> &lt; $Position])" /><br />
> </xsl:template>
>
> </xsl:stylesheet>
>
>
> The result :-
> 0
> 10.11
> 30.33
> 60.66
> 101.1
> 151.64999999999998
> 161.76
>
> I am worried about the output 151.64999999999998. Why is it
> outputting this
> value?

Because XPath uses a floating-point numbers <http://www.w3.org/TR/xpath#numbers>.

> I am expecting to be upto 2 decimal places or 1 decimal places.
>
> Well I can mask it upto 2 decimal places but I do not have a
> liberty to do
> that.

How about

<xsl:variable name="SubTotals">
<xsl:for-each select="/documents/value">
<value>
<xsl:value-of select=". * 100" />
</value>
</xsl:for-each>
</xsl:variable>
...
<xsl:template match="value">
<xsl:variable name="Position" select="position()" />
<xsl:value-of select="sum(exsl:node-set($SubTotals)/value[position() &lt; $Position]) div 100" />
<br />
</xsl:template>

Seems to give the expecter result.

0
10.11
30.33
60.66
101.1
151.65
161.76

Cheers,

Jarno