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| <helpdocument version="1.0"> |
| <meta> |
| <topic id="textsbasicshared03080202xml" indexer="include" status="PUBLISH"> |
| <title id="tit" xml-lang="en-US">Log Function [Runtime]</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> |
| <paragraph role="heading" id="hd_id3149416" xml-lang="en-US" level="1" l10n="U"><link href="text/sbasic/shared/03080202.xhp" name="Log Function [Runtime]">Log Function [Runtime]</link></paragraph> |
| <paragraph role="paragraph" id="par_id3145066" xml-lang="en-US" l10n="U">Returns the natural logarithm of a number.</paragraph> |
| </section> |
| <paragraph role="heading" id="hd_id3159414" xml-lang="en-US" level="2" l10n="U">Syntax:</paragraph> |
| <paragraph role="paragraph" id="par_id3154760" xml-lang="en-US" l10n="U">Log (Number)</paragraph> |
| <paragraph role="heading" id="hd_id3149457" xml-lang="en-US" level="2" l10n="U">Return value:</paragraph> |
| <paragraph role="paragraph" id="par_id3150791" xml-lang="en-US" l10n="U">Double</paragraph> |
| <paragraph role="heading" id="hd_id3151211" xml-lang="en-US" level="2" l10n="U">Parameters:</paragraph> |
| <paragraph role="paragraph" id="par_id3151041" xml-lang="en-US" l10n="U"><emph>Number:</emph> Any numeric expression that you want to calculate the natural logarithm for.</paragraph> |
| <paragraph role="paragraph" id="par_id3150869" xml-lang="en-US" l10n="U">The natural logarithm is the logarithm to the base e. Base e is a constant with an approximate value of 2.718282...</paragraph> |
| <paragraph role="paragraph" id="par_id3153968" xml-lang="en-US" l10n="U">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 role="paragraph" id="par_id3145420" xml-lang="en-US" l10n="U">Log n(x) = Log(x) / Log(n)</paragraph> |
| <embed href="text/sbasic/shared/00000003.xhp#errorcode"/> |
| <embed href="text/sbasic/shared/00000003.xhp#err5"/> |
| <paragraph role="heading" id="hd_id3155131" xml-lang="en-US" level="2" l10n="U">Example:</paragraph> |
| <paragraph role="paragraph" id="par_id3152463" xml-lang="en-US" l10n="U">Sub ExampleLogExp</paragraph> |
| <paragraph role="paragraph" id="par_id3145750" xml-lang="en-US" l10n="U">Dim a as Double</paragraph> |
| <paragraph role="paragraph" id="par_id3151116" xml-lang="en-US" l10n="U">Dim const b1=12.345e12</paragraph> |
| <paragraph role="paragraph" id="par_id3146985" xml-lang="en-US" l10n="U">Dim const b2=1.345e34</paragraph> |
| <paragraph role="paragraph" id="par_id3148616" xml-lang="en-US" l10n="U">a=Exp( Log(b1)+Log(b2) )</paragraph> |
| <paragraph role="paragraph" id="par_id3149262" xml-lang="en-US" l10n="U">MsgBox "" & a & chr(13) & (b1*b2) ,0,"Multiplication by logarithm function"</paragraph> |
| <paragraph role="paragraph" id="par_id3155411" xml-lang="en-US" l10n="U">end sub</paragraph> |
| </body> |
| </helpdocument> |
