[PPL-devel] Equivalent dimensions
mario at cs.unm.edu
Fri Jul 22 23:28:57 CEST 2005
Thanks! It's true that you already answered the question but I was
looking for an example....
P M Hill wrote:
> On Thu, 21 Jul 2005, Mario Mendez wrote:
>> Thank you! Another question then:
>> How can I insert dimensions in the middle?
>> E.G: convert
>> [B=2,E=8] Dim= N
>> in [B=2,G=8] Dim = N + 2
>> after inserting two "universe" dimensions between the original B and
>> E. I already know how to add at the beginning/end, but no idea about
>> how to use the library for this particular purpose.
> I am not completely clear. If you mean that you want to insert two
> dimensions between the "B" and "C" dimensions, and rename the "E"
> dimension as "G", then here is a snippet of Prolog that does this.
> T = c,
> ppl_new_Polyhedron_from_space_dimension(T, 5, universe, P),
> ppl_Polyhedron_add_constraints(P, [B = 2, E = 8]),
> ppl_Polyhedron_add_space_dimensions_and_embed(P, 2),
> [A-A, B-B, C-E, D-F, E-G, F-C, G-D]),
> ppl_new_Polyhedron_from_space_dimension(T, 7, universe, Q),
> ppl_Polyhedron_add_constraints(Q, [B = 2, G = 8]),
> ppl_Polyhedron_equals_Polyhedron(P, Q).
> Basically, I have added the 2 new dimensions to the end and then use the
> "map_space_dimensions" predicate to rearrange the order of the dimensions.
>> PS: I'm working in a abstract domain based on your library for finding
>> linear invariants....
> Best wishes,
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