TPS-Specific Functions

clearord(t1::TPS, order::Integer)

Returns a new TPS equal to t1 but with all monomial coefficients at the given order cleared (set equal to 0).

clearord!(t::TPS, order::Integer) -> t

Clears all monomial coefficients in t at order order.

clear!(t::TPS)

Clears all monomial coefficients in the TPS (sets to 0).

complex!(t::ComplexTPS64; tre=nothing, tim=nothing)

Sets t to so that real(t)=tre and imag(t)=tim in place.

compose!(m, m2, m1) -> m

Composes the TPSs (or TPS maps) m2 ∘ m1, and sets m equal to the result. If the GTPSA has more than 1 variable or parameter, then m1 must be an array with length equal to the total number of variables and parameters.

Arguments

• m::Union{AbstractArray{TPS{T,D}},TPS{T,D}}
• m2::Union{AbstractArray{TPS{T,D2}},TPS{T,D2}}
• m1::Union{AbstractArray{TPS{T,D1}},TPS{T,D1}}

cutord(t1::TPS, order::Integer)

Cuts out the monomials in t1 at the given order and above. Or, if order is negative, will cut monomials with orders at and below abs(order).

Examples

julia> d = Descriptor(1, 10);

julia> Δx = first(@vars(d));

julia> cutord(sin(Δx), 5)
TPS64{Descriptor(NV=1, MO=10)}:
 Coefficient                Order   Exponent
  1.0000000000000000e+00      1      1
 -1.6666666666666666e-01      3      3


julia> cutord(sin(Δx), -5)
TPS64{Descriptor(NV=1, MO=10)}:
 Coefficient                Order   Exponent
 -1.9841269841269841e-04      7      7
  2.7557319223985893e-06      9      9

cutord!(t::TPS{T}, t1::TPS{T}, order::Integer) where {T} -> t

Cuts out the monomials in t1 at the given order and above. Or, if order is negative, will cut monomials with orders at and below abs(order). t is set to the result. See the documentation for cutord for examples.

cycle!(t::TPS, i, n, m_, v_)

Given a starting index i (-1 if starting at 0), will optionally fill monomial m_ (if m != C_NULL, and m_ is a DenseVector{UInt8}) with the monomial at index i and optionally the value at v_ with the monomials coefficient (if v_ != C_NULL, and v_ is a Ref{<:Union{Float64,ComplexF64}}), and return the next NONZERO monomial index in the TPS. This is useful for iterating through each monomial in the TPSA.

Input

• t – TPS to scan
• i – Index to start from (-1 to start at 0)
• n – Length of monomial
• m_ – (Optional) Monomial to be filled if provided
• v_ – (Optional) Pointer to value of coefficient

Output

• i – Index of next nonzero monomial in the TPSA, or -1 if reached the end

deriv(t1::TPS, monomialindex)
∂(t1::TPS, monomialindex)

Differentiates t1 wrt the variable/parameter specified by the variable/parameter index, or alternatively any monomial specified by indexing-by-order OR indexing-by-sparse monomial.

Examples: Variable/Parameter Index:

julia> d = Descriptor(2, 5);

julia> Δx = @vars(d);

julia> deriv(Δx[1] + 2*Δx[2] + 3*Δx[1]*Δx[2], 1)
TPS64{Descriptor(NV=2, MO=5)}:
 Coefficient                Order   Exponent
  1.0000000000000000e+00      0      0   0
  3.0000000000000000e+00      1      0   1


julia> deriv(Δx[1] + 2*Δx[2] + 3*Δx[1]*Δx[2], 2)
TPS64{Descriptor(NV=2, MO=5)}:
 Coefficient                Order   Exponent
  2.0000000000000000e+00      0      0   0
  3.0000000000000000e+00      1      1   0

Examples: Monomial Index-by-Order

julia> deriv(Δx[1] + 2*Δx[2] + 3*Δx[1]*Δx[2], [1,0])
TPS64{Descriptor(NV=2, MO=5)}:
 Coefficient                Order   Exponent
  1.0000000000000000e+00      0      0   0
  3.0000000000000000e+00      1      0   1


julia> deriv(Δx[1] + 2*Δx[2] + 3*Δx[1]*Δx[2], [1,1])
TPS64{Descriptor(NV=2, MO=5)}:
 Coefficient                Order   Exponent
  3.0000000000000000e+00      0      0   0

Examples: Monomial Index-by-Sparse Monomial

julia> deriv(Δx[1] + 2*Δx[2] + 3*Δx[1]*Δx[2], [1=>1])
TPS64{Descriptor(NV=2, MO=5)}:
 Coefficient                Order   Exponent
  1.0000000000000000e+00      0      0   0
  3.0000000000000000e+00      1      0   1


julia> deriv(Δx[1] + 2*Δx[2] + 3*Δx[1]*Δx[2], [2=>1])
TPS64{Descriptor(NV=2, MO=5)}:
 Coefficient                Order   Exponent
  2.0000000000000000e+00      0      0   0
  3.0000000000000000e+00      1      1   0

deriv!(t::TPS{T}, t1::TPS{T}, monomialindex) where {T} -> t 
∂!(t::TPS{T}, t1::TPS{T}, monomialindex)     where {T} -> t

Differentiates t1 wrt the variable/parameter specified by the variable/parameter index, or alternatively any monomial specified by indexing-by-order OR indexing-by-sparse monomial, and sets t equal to the result in-place. See the deriv documentation for examples.

evaluate(m, x)

Evaluates the TPS function m at the result x.

Arguments

• m::Union{TPS,AbstractArray{TPS{T,D}}} – TPS or TPS map to evaluate
• x::Union{Number,AbstractArray{<:Number}} – Value(s) of the variable(s) to evaluate m at

Evaluate can also be called by "calling" m, e.g. m(x), m([x[1], x[2], ...]), or m(x[1], x[2], ...) is also allowed.

evaluate!(y, m, x) -> y

Evaluates the TPS function m at the point x and mutates y to contain the result.

Arguments

• y::Union{Ref{T},AbstractArray{T}} – Container to store result of evaluating m at x
• m::Union{TPS{T,D},AbstractArray{TPS{T,D}}} – TPS or TPS map to evaluate
• x::Union{Ref{T},AbstractArray{T}} – Value(s) of the variables to evaluate m at

fgrad(F::AbstractArray{TPS{T,D}}, h::TPS) where {T,D}

Calculates F⋅∇h.

fgrad!(g::TPS{T}, F::AbstractArray{TPS{T,D}}, h::TPS{T}) where {T,D} -> g

Calculates F⋅∇h and sets g equal to the result.

getord(t1::TPS, order::Integer)

Extracts one homogenous polynomial from t1 of the given order.

getord!(t::TPS{T}, t1::TPS{T}, order::Integer) where {T} -> t

Extracts one homogenous polynomial from t1 of the given order and sets t to the result in-place.

integ(t1::TPS, var::Integer=1)
∫(t1::TPS, var::Integer=1)

Integrates t1 wrt the variable var.

integ!(t::TPS{T}, t1::TPS{T}, var=1) where {T} -> t
∫!(t::TPS{T}, t1::TPS{T}, var=1) where {T} -> t

Integrates t1 wrt the variable var and sets t equal to the result.

inv!(m, m1)

Inverts the TPS map m1 and sets m equal to the result. The scalar part of m1 is ignored, so the user is responsible for ensuring the coordinate system is correct by either translating m or translating the coordinate system.

Also see GTPSA.inv, which only acts on AbstractArray{TPS{T,D}} types.

Arguments

• m::Union{AbstractArray{TPS{T,D}},TPS{T,D}}
• m1::Union{AbstractArray{TPS{T,D1}},TPS{T,D1}}

normTPS(t1::TPS)

Calculates the 1-norm of the TPS, which is the sum of the abs of all coefficients.

numcoefs(t::TPS)

Returns the maximum number of monomials (including the scalar part) in the TPS/ComplexTPS64 given its Descriptor.

numtype(t::Number)
numtype(::Type{T}) where {T<:Number}

If a TPS, then returns the type of number which the TPS represents. Else, returns that number type.

scalar(t::TPS)

Extracts the scalar part of the TPS. Equivalent to t[0] but this can be easily broadcasted.

setTPS!(t::TPS, t1::Number; change::Bool=false) -> t

General function for setting a TPS t equal to t1. If change is true, then t and t1 can have different Descriptors (with invalid monomials removed) so long as the number of variables + number of parameters are equal.

translate(m1, x) where {T1,D}

Translates the expansion point of m1 by x.

Arguments

• m1::Union{AbstractArray{TPS{T1,D}},TPS} – TPS or TPS map to translate
• x::Union{Number,AbstractArray{<:Number}} – Amount(s) to translate the expansion point of each variable

translate!(m, m1, x) -> m

Sets m to m1 with its expansion point translated by x.

Arguments

• m::Union{AbstractArray{TPS{T,D}},TPS{T,D}} – Output TPS or TPS map containing m translated by x
• m1::Union{AbstractArray{TPS{T,D1}},TPS{T,D1}} – TPS or TPS map to translate by x
• x::Union{Ref{T},AbstractArray{T}} – Amount to translate the expansion point of m1 by each variable. If the GTPSA has only 1 variable, then this may be a Ref.