helpcontent2/source/text/sbasic/shared/03080202.xhp


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<meta>
  <topic id="textsbasicshared03080202xml" indexer="include" status="PUBLISH">
    <title id="tit" xml-lang="en-US">Log Function</title>
    <filename>/text/sbasic/shared/03080202.xhp</filename>
  </topic>
</meta>

<body>

<section id="log">
<bookmark xml-lang="en-US" branch="index" id="bm_id3149416">
  <bookmark_value>Log function</bookmark_value>
</bookmark>

<h1 id="hd_id3149416"><link href="text/sbasic/shared/03080202.xhp">Log Function (BASIC)</link></h1>
<paragraph id="par_id3145066" role="paragraph" xml-lang="en-US">Returns the natural logarithm of a number.</paragraph>
</section>

<embed href="text/sbasic/shared/00000003.xhp#functsyntax"/>
<bascode>
<paragraph id="par_id3154760" role="bascode" xml-lang="en-US">Log (Number)</paragraph>
</bascode>

<embed href="text/sbasic/shared/00000003.xhp#functvalue"/>
<paragraph id="par_id3150791" localize="false" role="paragraph">Double</paragraph>

<embed href="text/sbasic/shared/00000003.xhp#functparameters"/>
<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>
<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>
<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>
<paragraph id="par_id3145420" role="paragraph" xml-lang="en-US">Log<sub>n</sub>(x) = Log(x) / Log(n)</paragraph>
<embed href="text/sbasic/shared/00000003.xhp#errorcode"/>
<embed href="text/sbasic/shared/00000003.xhp#err5"/>

<embed href="text/sbasic/shared/00000003.xhp#functexample"/>
<bascode>
<paragraph id="par_idm1341571344" role="bascode" localize="false" xml-lang="en-US">Sub ExampleLogExp</paragraph>
<paragraph id="par_idm1341570112" role="bascode" localize="false" xml-lang="en-US">Dim a As Double</paragraph>
<paragraph id="par_idm1341568880" role="bascode" localize="false" xml-lang="en-US">Dim Const b1=12.345e12</paragraph>
<paragraph id="par_idm1341567648" role="bascode" localize="false" xml-lang="en-US">Dim Const b2=1.345e34</paragraph>
<paragraph id="par_idm1341566416" role="bascode" localize="false" xml-lang="en-US">    a=Exp( Log(b1)+Log(b2) )</paragraph>
<paragraph id="par_id3149262" role="bascode" xml-lang="en-US">    MsgBox "" &amp; a &amp; chr(13) &amp; (b1*b2) ,0,"Multiplication by logarithm function"</paragraph>
<paragraph id="par_idm1341563312" role="bascode" localize="false" xml-lang="en-US">End Sub</paragraph>
</bascode>
</body>
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