try

  <xsl:variable name="TotalSum" select="sum(AAA/BBB[string(number(.)) !=
'NaN'])" />

This sums all AAA/BBB that are numeric (whose "number()" value is not 'NaN')

Don


-----Original Message-----
From: Scott Downie [mailto:sdownie@xxxxxxxxxxxxxxxxxxxx]
Sent: Wednesday, March 07, 2001 10:38 AM
To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
Subject:  Converting non-numeric characters to numbers


I have been thrown into XSL and XML head first and have bumped into a
stumbling block.

I am trying to use the sum() function, but part of the data I am
receiving in the XML is non-numeric.

For example my XML would be as follows:
<AAA>
   <BBB>123</BBB>
   <BBB>456</BBB>
   <BBB>-</BBB>
   <BBB>789</BBB>
</AAA>

The XSL I am trying to use is
<xsl:variable name="TotalSum" select="sum(AAA/BBB)">

When doing this I get back NaN.

I have also tried

<xsl:variable name="TotalSum" select="sum(AAA/BBB[not '-'])">

but return 0

I will eventually need to perform other calculations such as average,
min, max, and median so I need a way to exclude the '-' from my
calculations or convert it to '0' via XSL.

Any help would be appreciated.

Thanks in Advance.
Lindy

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 XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list