%set(name,sub)
%set(syntax,%%sub(a\,b)
%%-(a\,b))
%set(description,Returns the difference of two floating-point numbers.
Notes
If an argument is not a valid number\, it will be treated as if it were 0. 
Integer arguments to %%sub() are promoted to floating point. 
Floating point arguments to %%sub() are truncated to the nearest integer before subtracting. 
Only two arguments are examined. 
%%null%% is returned if only one argument is supplied.)
%set(author,)
%set(example,)
%set(seealso,)
