1*cdf0e10cSrcweir<?xml version="1.0" encoding="UTF-8"?> 2*cdf0e10cSrcweir 3*cdf0e10cSrcweir 4*cdf0e10cSrcweir<!--*********************************************************************** 5*cdf0e10cSrcweir * 6*cdf0e10cSrcweir * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 7*cdf0e10cSrcweir * 8*cdf0e10cSrcweir * Copyright 2000, 2010 Oracle and/or its affiliates. 9*cdf0e10cSrcweir * 10*cdf0e10cSrcweir * OpenOffice.org - a multi-platform office productivity suite 11*cdf0e10cSrcweir * 12*cdf0e10cSrcweir * This file is part of OpenOffice.org. 13*cdf0e10cSrcweir * 14*cdf0e10cSrcweir * OpenOffice.org is free software: you can redistribute it and/or modify 15*cdf0e10cSrcweir * it under the terms of the GNU Lesser General Public License version 3 16*cdf0e10cSrcweir * only, as published by the Free Software Foundation. 17*cdf0e10cSrcweir * 18*cdf0e10cSrcweir * OpenOffice.org is distributed in the hope that it will be useful, 19*cdf0e10cSrcweir * but WITHOUT ANY WARRANTY; without even the implied warranty of 20*cdf0e10cSrcweir * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 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If not, see 26*cdf0e10cSrcweir * <http://www.openoffice.org/license.html> 27*cdf0e10cSrcweir * for a copy of the LGPLv3 License. 28*cdf0e10cSrcweir * 29*cdf0e10cSrcweir ************************************************************************--> 30*cdf0e10cSrcweir 31*cdf0e10cSrcweir<helpdocument version="1.0"> 32*cdf0e10cSrcweir<meta> 33*cdf0e10cSrcweir<topic id="textsbasicshared03080202xml" indexer="include" status="PUBLISH"> 34*cdf0e10cSrcweir<title id="tit" xml-lang="en-US">Log Function [Runtime]</title> 35*cdf0e10cSrcweir<filename>/text/sbasic/shared/03080202.xhp</filename> 36*cdf0e10cSrcweir</topic> 37*cdf0e10cSrcweir<history> 38*cdf0e10cSrcweir<created date="2003-10-31T00:00:00">Sun Microsystems, Inc.</created> 39*cdf0e10cSrcweir<lastedited date="2004-08-24T13:28:25">converted from old format - fpe</lastedited> 40*cdf0e10cSrcweir</history> 41*cdf0e10cSrcweir</meta> 42*cdf0e10cSrcweir<body> 43*cdf0e10cSrcweir<section id="log"> 44*cdf0e10cSrcweir<bookmark xml-lang="en-US" branch="index" id="bm_id3149416"><bookmark_value>Log function</bookmark_value> 45*cdf0e10cSrcweir</bookmark> 46*cdf0e10cSrcweir<paragraph role="heading" id="hd_id3149416" xml-lang="en-US" level="1" l10n="U" oldref="1"><link href="text/sbasic/shared/03080202.xhp" name="Log Function [Runtime]">Log Function [Runtime]</link></paragraph> 47*cdf0e10cSrcweir<paragraph role="paragraph" id="par_id3145066" xml-lang="en-US" l10n="U" oldref="2">Returns the natural logarithm of a number.</paragraph> 48*cdf0e10cSrcweir</section> 49*cdf0e10cSrcweir<paragraph role="heading" id="hd_id3159414" xml-lang="en-US" level="2" l10n="U" oldref="3">Syntax:</paragraph> 50*cdf0e10cSrcweir<paragraph role="paragraph" id="par_id3154760" xml-lang="en-US" l10n="U" oldref="4">Log (Number)</paragraph> 51*cdf0e10cSrcweir<paragraph role="heading" id="hd_id3149457" xml-lang="en-US" level="2" l10n="U" oldref="5">Return value:</paragraph> 52*cdf0e10cSrcweir<paragraph role="paragraph" id="par_id3150791" xml-lang="en-US" l10n="U" oldref="6">Double</paragraph> 53*cdf0e10cSrcweir<paragraph role="heading" id="hd_id3151211" xml-lang="en-US" level="2" l10n="U" oldref="7">Parameters:</paragraph> 54*cdf0e10cSrcweir<paragraph role="paragraph" id="par_id3151041" xml-lang="en-US" l10n="U" oldref="8"> 55*cdf0e10cSrcweir<emph>Number:</emph> Any numeric expression that you want to calculate the natural logarithm for.</paragraph> 56*cdf0e10cSrcweir<paragraph role="paragraph" id="par_id3150869" xml-lang="en-US" l10n="U" oldref="9">The natural logarithm is the logarithm to the base e. Base e is a constant with an approximate value of 2.718282...</paragraph> 57*cdf0e10cSrcweir<paragraph role="paragraph" id="par_id3153968" xml-lang="en-US" l10n="U" oldref="10">You can calculate logarithms to any base (n) for any number (x) by dividing the natural logarithm of x by the natural logarithm of n, as follows:</paragraph> 58*cdf0e10cSrcweir<paragraph role="paragraph" id="par_id3145420" xml-lang="en-US" l10n="U" oldref="11">Log n(x) = Log(x) / Log(n)</paragraph> 59*cdf0e10cSrcweir<embed href="text/sbasic/shared/00000003.xhp#errorcode"/> 60*cdf0e10cSrcweir<embed href="text/sbasic/shared/00000003.xhp#err5"/> 61*cdf0e10cSrcweir<paragraph role="heading" id="hd_id3155131" xml-lang="en-US" level="2" l10n="U" oldref="12">Example:</paragraph> 62*cdf0e10cSrcweir<paragraph role="paragraph" id="par_id3152463" xml-lang="en-US" l10n="U" oldref="13">Sub ExampleLogExp</paragraph> 63*cdf0e10cSrcweir<paragraph role="paragraph" id="par_id3145750" xml-lang="en-US" l10n="U" oldref="14">Dim a as Double</paragraph> 64*cdf0e10cSrcweir<paragraph role="paragraph" id="par_id3151116" xml-lang="en-US" l10n="U" oldref="15">Dim const b1=12.345e12</paragraph> 65*cdf0e10cSrcweir<paragraph role="paragraph" id="par_id3146985" xml-lang="en-US" l10n="U" oldref="16">Dim const b2=1.345e34</paragraph> 66*cdf0e10cSrcweir<paragraph role="paragraph" id="par_id3148616" xml-lang="en-US" l10n="U" oldref="17">a=Exp( Log(b1)+Log(b2) )</paragraph> 67*cdf0e10cSrcweir<paragraph role="paragraph" id="par_id3149262" xml-lang="en-US" l10n="U" oldref="18">MsgBox "" & a & chr(13) & (b1*b2) ,0,"Multiplication by logarithm function"</paragraph> 68*cdf0e10cSrcweir<paragraph role="paragraph" id="par_id3155411" xml-lang="en-US" l10n="U" oldref="19">end sub</paragraph> 69*cdf0e10cSrcweir</body> 70*cdf0e10cSrcweir</helpdocument> 71