Update examples/structured_2d_dgsem/elixir_euler_convergence_implicit_sparse_jacobian.jl

Author: DanielDoehring

examples/structured_2d_dgsem/elixir_euler_convergence_implicit_sparse_jacobian.jl

@@ -131,7 +131,11 @@ sparse_adtype = AutoSparse(ad_type)
 
 # `sparse_cache` will reduce calculation time when Jacobian is calculated multiple times
 sparse_cache = sparse_jacobian_cache(sparse_adtype, sd, rhs, du_ode, u0_ode)
-# the jacobian eventually can be computed in-place using `sparse_jacobian!(J_prealloc, sparse_adtype, sparse_cache, rhs, du_ode, u0_ode)` where `J_prealloc` is a copy of `J`.
+# the jacobian eventually can be computed in-place using
+# `sparse_jacobian!(J_prealloc, sparse_adtype, sparse_cache, rhs, du_ode, u0_ode)`
+# where `J_prealloc` is constructed via
+# `J = sparse_jacobian(sparse_adtype, sparse_cache, rhs, du_ode, u0_ode)`
+# `J_prealloc = similar(J)`
 
 ###############################################################################################
 ### Set up sparse-aware ODEProblem ###