$Log2 or $Log 2: Difference between revisions
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{{DISPLAYTITLE:$Log2 or $Log_2}} | |||
<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 | ||
Revision as of 20:12, 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.