<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 14 (filtered medium)"><style><!--
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</o:shapelayout></xml><![endif]--></head><body lang=NL link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span lang=EN-US>Hi Eike,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>I'm looking at bug 109096.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>The problem here is that ODFF1.2 does not have constraints for the number values and neither specifies a complete result description.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>See http://docs.oasis-open.org/office/v1.2/os/OpenDocument-v1.2-os-part2.html#__RefHeading__1018690_715980110<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Geometric mean is defined as n-root( a1 * a2 * … * an). This applies for n positive values a#.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>This is awkward to compute as overflow is lurking in case of large values a and a large number n.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>An alternative computation is given in ODFF, but the case of any value a# being 0 is not mentioned (result is then 0).<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Any a# with value is a geometrically valid situation, unlike negative values which do not have any geometric meaning AFAIK.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>I would propose an amendment of ODFF1.2 for GEOMEAN:<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Constraints: numbers >= 0<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Semantics: addition of Returns zero when one or more numbers have value 0.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal>What's your opinion?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='mso-fareast-language:NL'>Winfried<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>