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Original file line number | Diff line number | Diff line change |
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module JuliaNLSolvers | ||
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using Gridap | ||
using NLsolve | ||
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export JuliaNLSolver | ||
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import Gridap: solve! | ||
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mutable struct JuliaNLSolver <: NonLinearSolver | ||
ls::LinearSolver | ||
kwargs::Dict | ||
end | ||
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function JuliaNLSolver(ls::LinearSolver;kwargs...) | ||
@assert ! haskey(kwargs,:linsolve) "linsolve cannot be used here. It is managed internally" | ||
JuliaNLSolver(ls,kwargs) | ||
end | ||
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function JuliaNLSolver(;kwargs...) | ||
ls = LUSolver() | ||
JuliaNLSolver(ls;kwargs...) | ||
end | ||
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mutable struct JuliaNLSolversCache | ||
df::OnceDifferentiable | ||
ss::SymbolicSetup | ||
result | ||
end | ||
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function solve!(x::AbstractVector,nls::JuliaNLSolver,op::NonLinearOperator) | ||
cache = _setup_cache(x,nls,op) | ||
solve!(x,nls,op,cache) | ||
cache | ||
end | ||
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function solve!( | ||
x::AbstractVector,nls::JuliaNLSolver,op::NonLinearOperator,cache::JuliaNLSolversCache) | ||
df = cache.df | ||
ss = cache.ss | ||
kwargs = nls.kwargs | ||
function linsolve!(x,A,b) | ||
ns = numerical_setup(ss,A) | ||
solve!(x,ns,A,b) | ||
end | ||
r = nlsolve(df,x;linsolve=linsolve!,kwargs...) | ||
cache.result = r | ||
x[:] .= r.zero | ||
end | ||
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function _setup_cache(x0,nls,op) | ||
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f!(r,x) = residual!(r,op,x) | ||
j!(j,x) = jacobian!(j,op,x) | ||
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f0 = residual(op,x0) | ||
j0 = jacobian(op,x0) | ||
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df = OnceDifferentiable(f!,j!,x0,f0,j0) | ||
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ss = symbolic_setup(nls.ls,j0) | ||
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JuliaNLSolversCache(df,ss,nothing) | ||
end | ||
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end # module |
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Original file line number | Diff line number | Diff line change |
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module JuliaNLSolversTests | ||
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using Test | ||
using Gridap | ||
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using ..NonLinearOperatorMocks | ||
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op = NonLinearOperatorMock() | ||
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nls = JuliaNLSolver(show_trace=false,method=:newton) | ||
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x = solve(nls,op) | ||
@test x ≈ [1.0, 3.0] | ||
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cache = solve!(x,nls,op) | ||
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solve!(x,nls,op,cache) | ||
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cache.result | ||
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end # module |
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