66 lines
3.6 KiB
XML
66 lines
3.6 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<helpdocument version="1.0">
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<!--
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* This file incorporates work covered by the following license notice:
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed
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* with this work for additional information regarding copyright
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* ownership. The ASF licenses this file to you under the Apache
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* License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.apache.org/licenses/LICENSE-2.0 .
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-->
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<meta>
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<topic id="textsbasicshared03080202xml" indexer="include" status="PUBLISH">
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<title id="tit" xml-lang="en-US">Log Function</title>
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<filename>/text/sbasic/shared/03080202.xhp</filename>
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</topic>
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</meta>
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<body>
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<section id="log">
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<bookmark xml-lang="en-US" branch="index" id="bm_id3149416">
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<bookmark_value>Log function</bookmark_value>
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</bookmark>
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<h1 id="hd_id3149416"><link href="text/sbasic/shared/03080202.xhp">Log Function (BASIC)</link></h1>
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<paragraph id="par_id3145066" role="paragraph" xml-lang="en-US">Returns the natural logarithm of a number.</paragraph>
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</section>
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<embed href="text/sbasic/shared/00000003.xhp#functsyntax"/>
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<bascode>
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<paragraph id="par_id3154760" role="bascode" xml-lang="en-US">Log (Number)</paragraph>
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</bascode>
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<embed href="text/sbasic/shared/00000003.xhp#functvalue"/>
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<paragraph id="par_id3150791" localize="false" role="paragraph">Double</paragraph>
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<embed href="text/sbasic/shared/00000003.xhp#functparameters"/>
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<paragraph id="par_id3151041" role="paragraph" xml-lang="en-US"> <emph>Number:</emph> Any numeric expression that you want to calculate the natural logarithm for.</paragraph>
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<paragraph id="par_id3150869" role="paragraph" xml-lang="en-US">The natural logarithm is the logarithm to the base e. Base e is a constant with an approximate value of 2.718282...</paragraph>
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<paragraph id="par_id3153968" role="paragraph" xml-lang="en-US">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>
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<paragraph id="par_id3145420" role="paragraph" xml-lang="en-US">Log<sub>n</sub>(x) = Log(x) / Log(n)</paragraph>
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<embed href="text/sbasic/shared/00000003.xhp#errorcode"/>
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<embed href="text/sbasic/shared/00000003.xhp#err5"/>
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<embed href="text/sbasic/shared/00000003.xhp#functexample"/>
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<bascode>
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<paragraph id="par_idm1341571344" role="bascode" localize="false" xml-lang="en-US">Sub ExampleLogExp</paragraph>
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<paragraph id="par_idm1341570112" role="bascode" localize="false" xml-lang="en-US">Dim a As Double</paragraph>
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<paragraph id="par_idm1341568880" role="bascode" localize="false" xml-lang="en-US">Dim Const b1=12.345e12</paragraph>
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<paragraph id="par_idm1341567648" role="bascode" localize="false" xml-lang="en-US">Dim Const b2=1.345e34</paragraph>
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<paragraph id="par_idm1341566416" role="bascode" localize="false" xml-lang="en-US"> a=Exp( Log(b1)+Log(b2) )</paragraph>
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<paragraph id="par_id3149262" role="bascode" xml-lang="en-US"> MsgBox "" & a & chr(13) & (b1*b2) ,0,"Multiplication by logarithm function"</paragraph>
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<paragraph id="par_idm1341563312" role="bascode" localize="false" xml-lang="en-US">End Sub</paragraph>
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</bascode>
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</body>
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</helpdocument>
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