$Log or $Log e: Difference between revisions
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The <var>$Log</var> function returns the natural logarithm | The <var>$Log</var> function (or its alias, <var>$Log_e</var>) returns the natural logarithm | ||
(the logarithm base ''[http://en.wikipedia.org/wiki/E_%28mathematical_constant%29 e]'') of the number ''x''. | (the logarithm base ''[http://en.wikipedia.org/wiki/E_%28mathematical_constant%29 e]'') of the number ''x''. | ||
==Syntax== | ==Syntax== | ||
<p class="syntax"><span class="term">%num</span><span class="literal"> = $Log(</span><span class="term">x</span><span class="literal">)</span> </p> | <p class="syntax"><span class="term">%num</span><span class="literal"> = $Log(</span><span class="term">x</span><span class="literal">)</span> </p> | ||
<p class="syntax"><span class="term">%num</span><span class="literal"> = $Log_e(</span><span class="term">x</span><span class="literal">)</span> </p> | |||
If ''x'' is not greater than 0, an error message is printed and a 0 is returned. | If ''x'' is not greater than 0, an error message is printed and a 0 is returned. | ||
{{Template:Math $functions note}} | {{Template:Math $functions note}} | ||
Revision as of 20:07, 10 January 2012
Log function
Most Sirius $functions have been deprecated in favor of Object Oriented methods. The OO equivalent for the $Log function is the LogE function.
The $Log function (or its alias, $Log_e) returns the natural logarithm (the logarithm base e) of the number x.
Syntax
%num = $Log(x)
%num = $Log_e(x)
If x is not greater than 0, an error message is printed and a 0 is returned.
See the SIRFUNC EXEC parameter for an explanation of when this high-performance, high-precision version of the IBM mathematical function from the Sirius Mods is used, as opposed to the version of the $function in the Model 204 FUND or FUNDLE CSECT.