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[XSL-LIST Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] RE: Addition/Subtraction of numbers.
 At 06:24 PM 1/23/02, you wrote: I have the understanding that the XPath number() function will return the string 'NaN' if the parameter passed in is not a number. No, not exactly, it will return the number Not-a-Number (which if stringified comes out 'NaN'). Though, at a lower level, won't the same function called twice with identical parameter(s) return the same thing? Yes, it will (thank goodness). So, when would your test of "number($t1) = number($t1)" fail? When either number is Not-a-number. According to the Java Language Specification, which is cited by XPath (section 3.5) for its summary of the behavior of IEEE 754 double-precision numbers, "The equality operator == returns false if either operand is NaN" (of course in XPath the operator is '=' ... for now). So NaN is not equal to itself. It's confusing, but it comes with the territory of a number that is Not-a-Number. :-> Trust Jeni to be able to use this wrinkle productively. Cheers, Wendell ====================================================================== Wendell Piez mailto:wapiez@xxxxxxxxxxxxxxxx Mulberry Technologies, Inc. http://www.mulberrytech.com 17 West Jefferson Street Direct Phone: 301/315-9635 Suite 207 Phone: 301/315-9631 Rockville, MD 20850 Fax: 301/315-8285 ---------------------------------------------------------------------- Mulberry Technologies: A Consultancy Specializing in SGML and XML ====================================================================== XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list 
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