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Let remove_redundant_constraints return an empty list if infeasible #3623

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Let remove_redundant_constraints return an empty list if infeasible #3623

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fa3bcd3
let 'remove_redundant_constraints' return empty list
schillic Jul 26, 2024
5709add
test for return status of 'remove_redundant_constraints'
schillic Jul 26, 2024
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5 changes: 2 additions & 3 deletions src/Interfaces/AbstractPolyhedron_functions.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -235,7 +235,7 @@ Remove the redundant constraints of a given list of linear constraints.
linear program
### Output

The list of constraints with the redundant ones removed, or an empty set if the
The list of constraints with the redundant ones removed, or an empty list if the
constraints are infeasible.

### Notes
Expand All @@ -253,8 +253,7 @@ function remove_redundant_constraints(constraints::AbstractVector{S};
if remove_redundant_constraints!(constraints_copy; backend=backend)
return constraints_copy
else # the constraints are infeasible
N = eltype(first(constraints))
return EmptySet{N}(dim(constraints[1]))
return Vector{eltype(constraints)}(undef, 0)
end
end

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4 changes: 4 additions & 0 deletions src/Sets/HPolyhedron/ishyperplanar.jl
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Expand Up @@ -6,6 +6,10 @@ function ishyperplanar(P::HPolyhedron)
if m > 2
# try to remove redundant constraints
clist = remove_redundant_constraints(clist)
if isempty(clist)
# constraints are contradictory
return false
end
m = length(clist)
end
if m != 2
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