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RE: Floating point precision error

2006-01-26 01:49:23
I agree, this result is way out. It looks to me suspiciously as if it's
carried out using single-precision rather than double-precision floating
point.

Saxon (both 6.5.5 and 8.6.1) give

<?xml version="1.0" encoding="utf-8"?>6.4_
  3000_
  19200_  

dom4j doesn't include an XSLT processor of its own, as far as I know. Use
xsl:system-property('xsl:vendor') to find out which processor you are using.

I changed the code to explicitly use single-precision float and the result
was

<?xml version="1.0" encoding="UTF-8"?>6.4_
  3000_
  19200.000286102295_  

which is still closer than the result you are seeing.

Michael Kay
http://www.saxonica.com/

 

-----Original Message-----
From: Thang Le [mailto:tle(_at_)neptium(_dot_)com] 
Sent: 26 January 2006 01:16
To: xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com
Subject: [xsl] Floating point precision error

This is something I don't understand. Given this XSL snippet:

<xsl:value-of select="$nodes[1]/unitamount" />_
<xsl:value-of select="$nodes[1]/quantity" />_
<xsl:value-of select="($nodes[1]/quantity * $nodes[1]/unitamount)" />_

I'm getting the printout as:
6.4_
3000_
19199.908447265625_ 

The literal values in XML is 6.4 and 3000. If I round the result to 2 
decimal places, I still get 19199.91, a far cry from what it 
should be 
(19200).

I'm using dom4j 1.6, so I guess that's XSLT 1.0? Also this 
only happens 
on SunOS and not on Windows. Still, the error is huge and obvious. 
Isn't there a way to force the calculation to be more exact?

Thanks,

Thang Le

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