Floating point related question

Hello Everyone,

We all know that using relational operators between
floating point numbers is a risky proposition.  This
code, for example, may never execute, believe it or
not, (I tried it):

      if (0.1+0.2 = 0.3) then
        report "Test";
      end if;

However, there are times when taking care of such
floating point errors may be needed.

In Matlab there is a function, called "eps" which
can help in incorporating such errors in equations.
http://www.mathworks.com/access/helpdesk/help/techdoc/ref/index.html?/ac
cess/helpdesk/help/techdoc/ref/eps.html&http://www.google.com/search?hl=
en&q=eps+function

I would like to find out whether there is a similar
function in VHDL-AMS.  For a moment I thought I could
use the T'succ(x) or related functions, but the problem
is that this would only work on discrete or physical
types.  The type "real" is not one of these.  Could
someone give me some ideas how to go about this?

Thanks, and Happy Holidays...

Arpad
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