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Re: Mathematical accuracy in xpath

From: Martin Honnen <mahotrash@-----.-->
To: NULL
Date: 6/16/2009 3:15:00 PM
kinobo wrote:
> If I execute the following xslt I get the result given below.
> I'm no mathematician but 100 times 2500.01 does not equal 250001.00000000003



Well XPath 1.0 uses double floating point numbers like JavaScript or 
Java do too and with these there is limited precision, in particular 
when there is no finite binary representation of a number.

With XSLT 1.0 you can use format-number to ensure you get a certain 
number of decimal positions. Or you need to change to XPath 2.0 (as 
implemented by Saxon 9) and use xs:decimal numbers instead of double 
numbers.

-- 

	Martin Honnen --- MVP XML
	http://msmvps.com/blogs/martin_honnen/


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