RE: [sv-ec] New Mantis on Coverage Calculation Corner Cases

Doug/Arturo,

I agree that negative weights are not needed and could be considered an
error.  However, I'm not sure about zero coverage when all weights are
zero.  I would like to be able to have two possibilities for a coverage
point I did not want to participate in the overall coverage grade: I can
still see its grade or I don't see it at all.  The weight of zero is how
I would achieve the first.  If a group of coverage points who all have
weight of zero show me a grade of zero, then I am prevented from seeing
the actual achievement for that group.  The solution that allows me to
see the grade for a group with all weights zero but does not affect the
overall grade is to calculate the grade as if all the weights were one
but then assign a weight of zero to the group grade.

Mark

-----Original Message-----
From: owner-sv-ec@eda.org [mailto:owner-sv-ec@eda.org] On Behalf Of
Arturo Salz
Sent: Monday, October 30, 2006 2:45 PM
To: Warmke, Doug; sv-ec@eda.org
Subject: RE: [sv-ec] New Mantis on Coverage Calculation Corner Cases

Doug,

I added a bugnote expressing my opinion:

1) If the sum of all weights (Wi) is zero then the coverage (Cg) should
yield zero.

2) A negative weight should be an error. Unsigned weights are likely to
just generate garbage reports and force more work upon users.

	Arturo

-----Original Message-----
From: owner-sv-ec@eda.org [mailto:owner-sv-ec@eda.org] On Behalf Of
Warmke, Doug
Sent: Saturday, October 28, 2006 4:22 PM
To: sv-ec@eda.org
Subject: [sv-ec] New Mantis on Coverage Calculation Corner Cases

Hi All,

Some simple corner cases were identified in 18.10 on Coverage
Calculations.  The first is if the sum of all weights Wi in the
denominator of the Cg equation is 0.
The second is what to do about negative weights.

Can you please read
  http://eda.org/svdb/bug_view_page.php?bug_id=0001655
and express any opinions on the two corner cases?

Thanks,
Doug