$Log10 or $Log_10
Log base 10 function
Note: Most Sirius $functions have been deprecated in favor of Object Oriented methods. The OO equivalent for the $Log10 function is the Log10 function.
The $Log10 function (or its alias, $Log_10) returns the base-10 logarithm of the number x.
Syntax
%num = $Log10(x)
%num = $Log_10(x)
If x is not greater than 0, an error message is printed and a 0 is returned.