Re: [PPL-devel] Widening operation in Powerset

On 06/17/11 21:22, Gokul Ramaswamy wrote:

I have understood that, in the polyhedron class, there is a BHRZ03_widening_assign() function which

basically does the widening operation. But I am dealing with set of Polyhedrons, so I am using a Powerset class for it. But in the powerset class, I cannot find any widening operator. I want to do widening on my set of polyherdrons. Can someone please point me in the right direction in this regard.

Hi Gokul.

for the Pointset_Powerset (applied to any class of polyhedra) you can use BHZ03_widening_assign(). If an extrapolation operator (as opposed to a proper widening operator) is OK for you, there is also BGP99_extrapolation_assign().

Notice though that widening powersets of polyhedra is a rather advanced topic: you really have to read the library documentation. Cheers,

Roberto