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Comments explaining usage of ForwardDiff.jacobian #1800

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Jan 9, 2024
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Comments explaining usage of ForwardDiff.jacobian #1800

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6 changes: 6 additions & 0 deletions src/semidiscretization/semidiscretization.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -253,6 +253,9 @@ end

function _jacobian_ad_forward(semi, t0, u0_ode, du_ode, config)
new_semi = remake(semi, uEltype = eltype(config))
# Create anonymous function passed as first argument to `ForwardDiff.jacobian` to match
# `ForwardDiff.jacobian(f!, y::AbstractArray, x::AbstractArray,
# cfg::JacobianConfig = JacobianConfig(f!, y, x), check=Val{true}())`
J = ForwardDiff.jacobian(du_ode, u0_ode, config) do du_ode, u_ode
Trixi.rhs!(du_ode, u_ode, new_semi, t0)
end
Expand All @@ -279,6 +282,9 @@ end

function _jacobian_ad_forward_structarrays(semi, t0, u0_ode_plain, du_ode_plain, config)
new_semi = remake(semi, uEltype = eltype(config))
# Create anonymous function passed as first argument to `ForwardDiff.jacobian` to match
# `ForwardDiff.jacobian(f!, y::AbstractArray, x::AbstractArray,
# cfg::JacobianConfig = JacobianConfig(f!, y, x), check=Val{true}())`
J = ForwardDiff.jacobian(du_ode_plain, u0_ode_plain,
config) do du_ode_plain, u_ode_plain
u_ode = StructArray{SVector{nvariables(semi), eltype(config)}}(ntuple(v -> view(u_ode_plain,
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