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Extensible Markup Language  |  2002-01-24  |  1.9 KB  |  35 lines
  1. <?xml version="1.0" encoding="utf-8"?>
  2. <html><head><title>Log Function [Runtime]</title><meta name="filename" content="text/sbasic/common/03080202"/><meta name="language" content="en-US"/><help:css-file-link xmlns:help="http://openoffice.org/2000/help"/><!--The CSS style header method for setting styles--><style type="text/css">
  3.  
  4.         p.P1{
  5.                 }
  6.         p.P2{
  7.                 }
  8.         span.T1{
  9.                 font-weight:bold;}
  10.         </style></head><body>
  11.   
  12.   
  13.   <help:to-be-embedded Eid="log" xmlns:help="http://openoffice.org/2000/help">
  14.   <p class="Head1"><help:link Id="66597">Log Function [Runtime]</help:link></p>
  15.   <p class="Paragraph">Returns the natural logarithm of a number.</p>
  16.   </help:to-be-embedded>
  17.   <p class="Paragraph"><span class="T1">Syntax</span>:</p>
  18.   <p class="Paragraph">Log (Number) <help:key-word value="Log" tag="kw66597_1" xmlns:help="http://openoffice.org/2000/help"/></p>
  19.   <p class="Paragraph"><span class="T1">Return value</span>:</p>
  20.   <p class="Paragraph">Double</p>
  21.   <p class="Paragraph"><span class="T1">Parameter</span>:</p>
  22.   <p class="Paragraph">Number: Any numeric expression for which to calculate the natural logarithm.</p>
  23.   <p class="Paragraph">The natural logarithm is the logarithm to the base e. Base e is a constant with the approximate value 2.718282...</p>
  24.   <p class="Paragraph">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:</p>
  25.   <p class="Paragraph">Log n(x) = Log(x) / Log(n)</p>
  26.   <p class="P2">Example:</p>
  27.   <p class="PropText">Sub ExampleLogExp</p>
  28.   <p class="PropText">Dim a as Double</p>
  29.   <p class="PropText">Dim const b1=12.345e12</p>
  30.   <p class="PropText">Dim const b2=1.345e34</p>
  31.   <p class="PropText">a=Exp( Log(b1)+Log(b2) )</p>
  32.   <p class="PropText">MsgBox "" & a & chr(13) & (b1*b2) ,0,"Multiplication by logarithm function"</p>
  33.   <p class="PropText">end sub</p>
  34.   <p class="PropText"/>
  35.  </body></html>