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Add scale for SPZ #3908

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Merged
merged 4 commits into from
Jul 6, 2025
Merged

Add scale for SPZ #3908

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e6aeef8
added `scale` function for SPZ
alecarraro Jul 6, 2025
e50d6cd
Update test/Sets/SparsePolynomialZonotope.jl
alecarraro Jul 6, 2025
5903cac
Added `scale` to undocumented implementations
alecarraro Jul 6, 2025
d6775c0
Update docs/src/lib/sets/SparsePolynomialZonotope.md
alecarraro Jul 6, 2025
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2 changes: 1 addition & 1 deletion docs/src/lib/sets/SparsePolynomialZonotope.md
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Expand Up @@ -91,6 +91,7 @@ Undocumented implementations:
* [`extrema`](@ref extrema(::LazySet))
* [`isoperationtype`](@ref isoperationtype(::Type{LazySet}))
* [`linear_map`](@ref linear_map(::AbstractMatrix, ::LazySet))
* [`scale`](@ref scale(::Real, ::LazySet))
* [`translate`](@ref translate(::LazySet, ::AbstractVector))

```@meta
Expand Down Expand Up @@ -134,7 +135,6 @@ Inherited from [`LazySet`](@ref):
* [`is_interior_point`](@ref is_interior_point(::AbstractVector, ::LazySet))
* [`project`](@ref project(::LazySet, ::AbstractVector{Int}))
* [`sample`](@ref sample(::LazySet, ::Int=1))
* [`scale`](@ref scale(::Real, ::LazySet))
* [`σ`](@ref σ(::AbstractVector, ::LazySet))
* [`convex_hull`](@ref convex_hull(::LazySet, ::LazySet))
* [`≈`](@ref ≈(::LazySet, ::LazySet))
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7 changes: 7 additions & 0 deletions src/Sets/SparsePolynomialZonotope/scale.jl
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@@ -0,0 +1,7 @@
function scale(α::Real, P::SparsePolynomialZonotope)
return SparsePolynomialZonotope(α * center(P),
α * genmat_dep(P),
α * genmat_indep(P),
expmat(P),
indexvector(P))
end
8 changes: 8 additions & 0 deletions test/Sets/SparsePolynomialZonotope.jl
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Expand Up @@ -99,6 +99,14 @@ for N in [Float64, Float32, Rational{Int}]
Z = overapproximate(S, Zonotope)
@test isequivalent(Z, Zonotope(N[0, 0], N[1.5 1 1; 1.5 0 -1]))

α = 2.0
PZscaled = scale(α, PZ)
@test center(PZscaled) == N[8, 8]
@test genmat_dep(PZscaled) == N[4 2 4; 0 4 4]
@test genmat_indep(PZscaled) == hcat(N[2, 0])
@test expmat(PZscaled) == expmat(PZ)
@test PZscaled == linear_map(α * Matrix{N}(I, 2, 2), PZ)

# remove_redundant_generators
PZ = SparsePolynomialZonotope(N[-1, 2], N[1 2 0 2; 0 1 2 -1], N[1 0; 2 0], [1 0 1 2; 0 0 0 1])
PZreduced = remove_redundant_generators(PZ)
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