diff --git a/test/test_analytical_derivatives.jl b/test/test_analytical_derivatives.jl
index 05ac7773..0b6c8ae7 100644
--- a/test/test_analytical_derivatives.jl
+++ b/test/test_analytical_derivatives.jl
@@ -1,9 +1,181 @@
-using Dynare
+module TestDerivatives
+using Dynare #Use analytical_derivatives branch
+using LinearAlgebra
+using FastLapackInterface
+using Test
+using SparseArrays
+using SuiteSparse
 
+#Model
 context = @dynare "models/analytical_derivatives/fs2000_sa.mod" "params_derivs_order=1" "notmpterms";
-
+model = context.models[1]
+results = context.results.model_results[1]
+wss = Dynare.StaticWs(context)
 params = context.work.params
-steady_state = context.results.model_results[1].trends.endogenous_steady_state
-exogenous = context.results.model_results[1].trends.exogenous_steady_state
+steadystate = results.trends.endogenous_steady_state
+endogenous = repeat(steadystate, 3)
+exogenous = results.trends.exogenous_steady_state 
+
+#Get StaticJacobian
+df_dx = Dynare.get_static_jacobian!(wss, params, steadystate, exogenous, model) 
+
+#Get StaticJacobianParams
+(df_dp, gp) = Dynare.DFunctions.SparseStaticParametersDerivatives!(steadystate, exogenous, params)
+ 
+
+#1. Get Jacobian matrix using the inverse of df_dx
+struct DerivativesWorkspace
+    dense_df_dx::Matrix{Float64}
+    df_dx_inv::Matrix{Float64}
+    result::Matrix{Float64}
+end
+
+function init_derivatives_workspace(n::Int, m::Int)
+    dense_df_dx = Matrix{Float64}(undef, n, n)
+    df_dx_inv = Matrix{Float64}(undef, n, n)
+    result = Matrix{Float64}(undef, n, m)
+    return DerivativesWorkspace(dense_df_dx, df_dx_inv, result)
+end
+
+function Derivatives(workspace::DerivativesWorkspace, df_dx, df_dp)
+    dense_df_dx = workspace.dense_df_dx
+    copyto!(dense_df_dx, df_dx)
+
+    if det(dense_df_dx) == 0
+        error("The matrix is not invertible")
+    end
+
+    df_dx_inv = workspace.df_dx_inv
+    df_dx_inv .= dense_df_dx \ I
+
+    result = workspace.result
+    return mul!(result, -df_dx_inv, df_dp)
+end
+
+
+#2. Get Jacobian matrix using FastLapackInterface (dense matrix)
+struct Derivatives2Workspace
+    dense_df_dx::Matrix{Float64}
+    LU_df_dx::LU{Float64, Matrix{Float64}} #not used yet
+    dx_dp::Matrix{Float64}
+end
+
+
+function init_derivatives2_workspace(n::Int, m::Int)
+    dense_df_dx = Matrix{Float64}(undef, n, n)
+    LU_df_dx = lu(Matrix{Float64}(I, n, n)) #not used yet
+    dx_dp = Matrix{Float64}(undef, n, m)
+    return Derivatives2Workspace(dense_df_dx, LU_df_dx, dx_dp)
+end
+
+
+function Derivatives2(workspace::Derivatives2Workspace, df_dx, df_dp)
+    dense_df_dx = workspace.dense_df_dx
+    copyto!(dense_df_dx, df_dx)
+
+    LU_df_dx = LU(LAPACK.getrf!(LUWs(dense_df_dx), dense_df_dx)...)
+
+    if any(diag(LU_df_dx.U) .== 0)
+        error("The matrix is not invertible")
+    end
+
+    dx_dp = workspace.dx_dp
+    copyto!(dx_dp, -(LU_df_dx \ df_dp))
+    # ldiv!(-1.0, LU_df_dx, df_dp, dx_dp)
+
+    return dx_dp
+end
+
+#3. Get Jacobian matrix using lu(df_dx) (sparse matrix)
+struct Derivatives3Workspace
+    # df_dx::SparseMatrixCSC{Float64, Int64}
+    LU_df_dx::SuiteSparse.UMFPACK.UmfpackLU{Float64, Int64} #not used yet
+    dx_dp::Matrix{Float64}
+end
+
+function init_derivatives3_workspace(n::Int, m::Int)
+    LU_df_dx = SuiteSparse.UMFPACK.lu(sparse(Matrix{Float64}(I, n, n)))  #not used yet
+    dx_dp = Matrix{Float64}(undef, n, m)
+    return Derivatives3Workspace(LU_df_dx, dx_dp)
+end
+
+function Derivatives3(workspace::Derivatives3Workspace, df_dx, df_dp)
+    # Perform Sparse LU decomposition
+    # LU_df_dx = workspace.LU_df_dx
+    LU_df_dx = lu(df_dx)
+    # copyto!(LU_df_dx.L, lu_df_dx.L)
+    # copyto!(LU_df_dx.U, lu_df_dx.U)
+
+    if any(diag(LU_df_dx.U) .== 0)
+        error("The matrix is not invertible")
+    end
+
+    # Get dx_dp
+    dx_dp = workspace.dx_dp
+    copyto!(dx_dp, -(LU_df_dx \ df_dp))
+    # ldiv!(-1.0, LU_df_dx, df_dp, dx_dp)
+
+    return dx_dp
+end
+
+
+#4. Get Jacobian matrix using ldiv! (dense matrix)
+struct Derivatives4Workspace
+    dense_df_dx::Matrix{Float64}
+    LU_df_dx::LU{Float64, Matrix{Float64}}
+    dx_dp::Matrix{Float64}
+end
+
+function init_derivatives4_workspace(n::Int, m::Int)
+    dense_df_dx = Matrix{Float64}(undef, n, n)
+    LU_df_dx = lu(Matrix{Float64}(I, n, n))
+    dx_dp = Matrix{Float64}(undef, n, m)
+    return Derivatives4Workspace(dense_df_dx, LU_df_dx, dx_dp)
+end
+
+function Derivatives4(workspace::Derivatives4Workspace, df_dx, df_dp)
+    dense_df_dx = workspace.dense_df_dx
+    copyto!(dense_df_dx, Matrix(df_dx))
+    
+    # LU_df_dx = workspace.LU_df_dx
+    LU_df_dx = lu(dense_df_dx)
+    # copyto!(LU_df_dx.L, lu_df_dx.L)
+    # copyto!(LU_df_dx.U, lu_df_dx.U)
+
+    if any(diag(LU_df_dx.U) .== 0)
+        error("The matrix is not invertible")
+    end
+
+    dx_dp = workspace.dx_dp
+    n, m = size(df_dp)
+
+    for i in 1:m
+        dp_col = view(df_dp, :, i)
+        sol_col = view(dx_dp, :, i)
+        ldiv!(sol_col, LU_df_dx, dp_col)
+        sol_col .*= -1
+    end
+
+    return dx_dp
+end
+
+
+# Initialize
+n = model.endogenous_nbr
+m = model.parameter_nbr
+workspace1 = init_derivatives_workspace(n, m)
+workspace2 = init_derivatives2_workspace(n, m)
+workspace3 = init_derivatives3_workspace(n, m)
+workspace4 = init_derivatives4_workspace(n, m)
+
+# Luego puedes utilizar workspace para llamar a la función Derivatives con tus matrices df_dx y df_dp
+@time sol1 = Derivatives(workspace1, df_dx, df_dp);
+@time sol2 = Derivatives2(workspace2, df_dx, df_dp);
+@time sol3 = Derivatives3(workspace3, df_dx, df_dp);
+@time sol4 = Derivatives4(workspace4, df_dx, df_dp);
 
-(rp, gp) = Dynare.DFunctions.SparseStaticParametersDerivatives!(steady_state, exogenous, params)
+# @show Derivatives(df_dx, df_dp);
+@test sol1 ≈ sol2
+@test sol1 ≈ sol3
+@test sol1 ≈ sol4 
+end # end module