1cdf0e10cSrcweir<?xml version="1.0" encoding="UTF-8"?> 2cdf0e10cSrcweir 3cdf0e10cSrcweir 4*d33d0967SAndrew Rist<!--*********************************************************** 5cdf0e10cSrcweir * 6*d33d0967SAndrew Rist * Licensed to the Apache Software Foundation (ASF) under one 7*d33d0967SAndrew Rist * or more contributor license agreements. See the NOTICE file 8*d33d0967SAndrew Rist * distributed with this work for additional information 9*d33d0967SAndrew Rist * regarding copyright ownership. The ASF licenses this file 10*d33d0967SAndrew Rist * to you under the Apache License, Version 2.0 (the 11*d33d0967SAndrew Rist * "License"); you may not use this file except in compliance 12*d33d0967SAndrew Rist * with the License. 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See the License for the 20*d33d0967SAndrew Rist * specific language governing permissions and limitations 21*d33d0967SAndrew Rist * under the License. 22cdf0e10cSrcweir * 23*d33d0967SAndrew Rist ***********************************************************--> 24*d33d0967SAndrew Rist 25*d33d0967SAndrew Rist 26cdf0e10cSrcweir 27cdf0e10cSrcweir<helpdocument version="1.0"> 28cdf0e10cSrcweir<meta> 29cdf0e10cSrcweir<topic id="textsbasicshared03080202xml" indexer="include" status="PUBLISH"> 30cdf0e10cSrcweir<title id="tit" xml-lang="en-US">Log Function [Runtime]</title> 31cdf0e10cSrcweir<filename>/text/sbasic/shared/03080202.xhp</filename> 32cdf0e10cSrcweir</topic> 33cdf0e10cSrcweir<history> 34cdf0e10cSrcweir<created date="2003-10-31T00:00:00">Sun Microsystems, Inc.</created> 35cdf0e10cSrcweir<lastedited date="2004-08-24T13:28:25">converted from old format - fpe</lastedited> 36cdf0e10cSrcweir</history> 37cdf0e10cSrcweir</meta> 38cdf0e10cSrcweir<body> 39cdf0e10cSrcweir<section id="log"> 40cdf0e10cSrcweir<bookmark xml-lang="en-US" branch="index" id="bm_id3149416"><bookmark_value>Log function</bookmark_value> 41cdf0e10cSrcweir</bookmark> 42cdf0e10cSrcweir<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> 43cdf0e10cSrcweir<paragraph role="paragraph" id="par_id3145066" xml-lang="en-US" l10n="U" oldref="2">Returns the natural logarithm of a number.</paragraph> 44cdf0e10cSrcweir</section> 45cdf0e10cSrcweir<paragraph role="heading" id="hd_id3159414" xml-lang="en-US" level="2" l10n="U" oldref="3">Syntax:</paragraph> 46cdf0e10cSrcweir<paragraph role="paragraph" id="par_id3154760" xml-lang="en-US" l10n="U" oldref="4">Log (Number)</paragraph> 47cdf0e10cSrcweir<paragraph role="heading" id="hd_id3149457" xml-lang="en-US" level="2" l10n="U" oldref="5">Return value:</paragraph> 48cdf0e10cSrcweir<paragraph role="paragraph" id="par_id3150791" xml-lang="en-US" l10n="U" oldref="6">Double</paragraph> 49cdf0e10cSrcweir<paragraph role="heading" id="hd_id3151211" xml-lang="en-US" level="2" l10n="U" oldref="7">Parameters:</paragraph> 50cdf0e10cSrcweir<paragraph role="paragraph" id="par_id3151041" xml-lang="en-US" l10n="U" oldref="8"> 51cdf0e10cSrcweir<emph>Number:</emph> Any numeric expression that you want to calculate the natural logarithm for.</paragraph> 52cdf0e10cSrcweir<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> 53cdf0e10cSrcweir<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> 54cdf0e10cSrcweir<paragraph role="paragraph" id="par_id3145420" xml-lang="en-US" l10n="U" oldref="11">Log n(x) = Log(x) / Log(n)</paragraph> 55cdf0e10cSrcweir<embed href="text/sbasic/shared/00000003.xhp#errorcode"/> 56cdf0e10cSrcweir<embed href="text/sbasic/shared/00000003.xhp#err5"/> 57cdf0e10cSrcweir<paragraph role="heading" id="hd_id3155131" xml-lang="en-US" level="2" l10n="U" oldref="12">Example:</paragraph> 58cdf0e10cSrcweir<paragraph role="paragraph" id="par_id3152463" xml-lang="en-US" l10n="U" oldref="13">Sub ExampleLogExp</paragraph> 59cdf0e10cSrcweir<paragraph role="paragraph" id="par_id3145750" xml-lang="en-US" l10n="U" oldref="14">Dim a as Double</paragraph> 60cdf0e10cSrcweir<paragraph role="paragraph" id="par_id3151116" xml-lang="en-US" l10n="U" oldref="15">Dim const b1=12.345e12</paragraph> 61cdf0e10cSrcweir<paragraph role="paragraph" id="par_id3146985" xml-lang="en-US" l10n="U" oldref="16">Dim const b2=1.345e34</paragraph> 62cdf0e10cSrcweir<paragraph role="paragraph" id="par_id3148616" xml-lang="en-US" l10n="U" oldref="17">a=Exp( Log(b1)+Log(b2) )</paragraph> 63cdf0e10cSrcweir<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> 64cdf0e10cSrcweir<paragraph role="paragraph" id="par_id3155411" xml-lang="en-US" l10n="U" oldref="19">end sub</paragraph> 65cdf0e10cSrcweir</body> 66cdf0e10cSrcweir</helpdocument> 67