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James DelaneySubject: substring-before and sums
Author: James Delaney
Date: 19 Jan 2010 04:39 PM
Originally Posted: 19 Jan 2010 04:37 PM
Hello all,

I have a simple problem that I haven't been able to figure out. I'm sure that I'm not applying something correct that you all may be easy to spot quickly:

I have a list of ages that have numerical and string data. I need to find the average age among the list. I can convert the data rows into numerical formats, but when I try to do calculations on it (like sum) it's returning an error (Input to sum() contains a value that is neither numeric, nor a duration).


XSL file:

<?xml version='1.0'?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

<xsl:template match="/Students">

<xsl:value-of select="sum(number(Student/substring-before(Age, '(')))"/>

</xsl:template>
</xsl:stylesheet>


XML file:

<?xml version="1.0"?>
<Students>
<Student>
<Age>21 (5 months)</Age>
</Student>
<Student>
<Age>46 (5 months)</Age>
</Student>
<Student>
<Age>15 (0 months)</Age>
</Student>
</Students>

Expected Results:
82
Postnext
Tony LavinioSubject: substring-before and sums
Author: Tony Lavinio
Date: 25 Jan 2010 02:15 PM
Your expression is still including the space after the number - you only trimmed off the text from the '(' forward. Try removing that space. There is also a number() function that can coerce a string to a number.
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James DelaneySubject: substring-before and sums
Author: James Delaney
Date: 25 Jan 2010 02:53 PM
Hello Mr. Lavinio,

Thank you for the response. I have attempted to strip the space and the same issue with the sum/number is occurring. Also, without any modification of the string, a number() seems to always result in NaN.

May you have any other suggestions? Thank you again for your assistance.
   
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