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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 style='color:#1F497D'>Hi Eike,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>As we now have changed GEOMEAN, I think it would be wise to try to improve ODFF1.2 as well for GEOMEAN.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'><o:p> </o:p></span></p><div><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:NL'>Winfried<o:p></o:p></span></p></div><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><div style='border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm 4.0pt'><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-language:NL'>Van:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-language:NL'> LibreOffice [mailto:libreoffice-bounces@lists.freedesktop.org] <b>Namens </b>Winfried Donkers<br><b>Verzonden:</b> woensdag 26 juli 2017 12:06<br><b>Aan:</b> libreoffice@lists.freedesktop.org; Eike Rathke (erack@redhat.com)<br><b>Onderwerp:</b> ODFF1.2 GEOMEAN<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><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 <a href="http://docs.oasis-open.org/office/v1.2/os/OpenDocument-v1.2-os-part2.html#__RefHeading__1018690_715980110">http://docs.oasis-open.org/office/v1.2/os/OpenDocument-v1.2-os-part2.html#__RefHeading__1018690_715980110</a><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></div></body></html>