$Log2 or $Log 2: Difference between revisions
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<span class="pageSubtitle">Log base 2 function</span> | <span class="pageSubtitle">Log base 2 function</span> | ||
<p class="warning">Most Sirius $functions have been deprecated in favor of Object Oriented | <p class="warning">Most Sirius $functions have been deprecated in favor of Object Oriented | ||
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</p> | </p> | ||
The <var>$Log2</var> function returns the base-2 logarithm | The <var>$Log2</var> function (or its alias, <var>$Log_2</var>) returns the base-2 logarithm | ||
of the number ''x''. | of the number ''x''. | ||
==Syntax== | ==Syntax== | ||
<p class="syntax"><span class="term">%num</span><span class="literal"> = $Log2(</span><span class="term">x</span><span class="literal">)</span> </p> | <p class="syntax"><span class="term">%num</span><span class="literal"> = $Log2(</span><span class="term">x</span><span class="literal">)</span> </p> | ||
<p class="syntax"><span class="term">%num</span><span class="literal"> = $Log_2(</span><span class="term">x</span><span class="literal">)</span> </p> | |||
If ''x'' is not greater than 0, | If ''x'' is not greater than 0, | ||
Revision as of 20:11, 10 January 2012
Log base 2 function
Most Sirius $functions have been deprecated in favor of Object Oriented methods. The OO equivalent for the $Log2 function is the Log2 function.
The $Log2 function (or its alias, $Log_2) returns the base-2 logarithm of the number x.
Syntax
%num = $Log2(x)
%num = $Log_2(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.