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Re: [xsl] XPath 1.0: sum() and precision

Subject: Re: [xsl] XPath 1.0: sum() and precision
From: Michael Kay <mike@xxxxxxxxxxxx>
Date: Fri, 28 Sep 2012 00:16:14 +0100

On 27/09/2012 23:09, Florent Georges wrote:
Andrew Welch wrote:


I guess if you are stuck with xpath 1.0 it would have to be
substring... (or split on the ., then round() on the first 3 digits
eg the 490)
   Thanks Andrew.  That's what I thought too, but I wanted to avoid
string functions for that purpose.  What I've done in the meantime is
replacing sum(...) by:

round(sum(...) * 100) div 100

that is, "moving the dot right", rounding as an integer, then "moving
the dot left" again.

But can't the "div 100" itself have a rounding error that means you don't get an exact answer?

In pure XPath 1.0, without format-number(), I suspect string manipulation is the only reliable way.

Michael Kay

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