fix non-determinism of chebyshev

Author: mileslucas

src/contrib.jl

@@ -27,4 +27,4 @@ end
     end
 end
 
-##
+##

src/polynomials/ChebyshevT.jl

@@ -81,7 +81,7 @@ julia> c.(-1:0.5:1)
 ```
 """
 function (ch::ChebyshevT{T})(x::S) where {T,S}
-    any(x .∉ domain(ch)) && error("$x outside of domain")
+    x ∉ domain(ch) && error("$x outside of domain")
     R = promote_type(T, S)
     length(ch) == 0 && return zero(R)
     length(ch) == 1 && return R(ch[0])
@@ -217,8 +217,8 @@ zseries
 
 function _c_to_z(cs::AbstractVector{T}) where {T}
     n = length(cs)
-    U = promote_type(T, typeof(one(T) / 2))
-    zs = Vector{U}(undef, 2n - 1)
+    U = typeof(one(T) / 2)
+    zs = zeros(U, 2n - 1)
     zs[n:end] = cs ./ 2
     return zs .+ reverse(zs)
 end

test/ChebyshevT.jl

@@ -95,10 +95,10 @@ end
 end
 
 @testset "Vander" begin
-    x = 0:3
+    x = 0:0.1:1
     v = vander(ChebyshevT, x, 5)
     @test size(v) == (length(x), 6)
-    @inbounds for i in eachindex(x)
+    @inbounds for i in 1:6
         coef = vcat(zeros(i - 1), 1)
         c = ChebyshevT(coef)
         @test v[:, i] ≈ c.(x)

test/runtests.jl

@@ -10,4 +10,4 @@ import SparseArrays: sparse, nnz
 @testset "Polynomial" begin include("Polynomial.jl") end
 @testset "ChebyshevT" begin include("ChebyshevT.jl") end
 @testset "Deprecations" begin include("deprecated.jl") end
-@testset "Poly (deprecaterd)" begin include("Poly.jl") end
+@testset "Poly (deprecated)" begin include("Poly.jl") end