changes before going to the lecture

Author: pevnak

docs/src/lecture_08/Manifest.toml

@@ -188,6 +188,12 @@ git-tree-sha1 = "8756f9935b7ccc9064c6eef0bff0ad643df733a3"
 uuid = "1a297f60-69ca-5386-bcde-b61e274b549b"
 version = "0.12.7"
 
+[[FiniteDifferences]]
+deps = ["ChainRulesCore", "LinearAlgebra", "Printf", "Random", "Richardson", "StaticArrays"]
+git-tree-sha1 = "c56a261e1a5472f20cbd7aa218840fd203243319"
+uuid = "26cc04aa-876d-5657-8c51-4c34ba976000"
+version = "0.12.19"
+
 [[FixedPointNumbers]]
 deps = ["Statistics"]
 git-tree-sha1 = "335bfdceacc84c5cdf16aadc768aa5ddfc5383cc"
@@ -411,9 +417,9 @@ uuid = "8f399da3-3557-5675-b5ff-fb832c97cbdb"
 
 [[Libffi_jll]]
 deps = ["Artifacts", "JLLWrappers", "Libdl", "Pkg"]
-git-tree-sha1 = "761a393aeccd6aa92ec3515e428c26bf99575b3b"
+git-tree-sha1 = "0b4a5d71f3e5200a7dff793393e09dfc2d874290"
 uuid = "e9f186c6-92d2-5b65-8a66-fee21dc1b490"
-version = "3.2.2+0"
+version = "3.2.2+1"
 
 [[Libgcrypt_jll]]
 deps = ["Artifacts", "JLLWrappers", "Libdl", "Libgpg_error_jll", "Pkg"]
@@ -682,6 +688,12 @@ git-tree-sha1 = "4036a3bd08ac7e968e27c203d45f5fff15020621"
 uuid = "ae029012-a4dd-5104-9daa-d747884805df"
 version = "1.1.3"
 
+[[Richardson]]
+deps = ["LinearAlgebra"]
+git-tree-sha1 = "e03ca566bec93f8a3aeb059c8ef102f268a38949"
+uuid = "708f8203-808e-40c0-ba2d-98a6953ed40d"
+version = "1.4.0"
+
 [[SHA]]
 uuid = "ea8e919c-243c-51af-8825-aaa63cd721ce"
 

docs/src/lecture_08/Project.toml

@@ -1,5 +1,6 @@
 [deps]
 ChainRules = "082447d4-558c-5d27-93f4-14fc19e9eca2"
+FiniteDifferences = "26cc04aa-876d-5657-8c51-4c34ba976000"
 GraphRecipes = "bd48cda9-67a9-57be-86fa-5b3c104eda73"
 LightGraphs = "093fc24a-ae57-5d10-9952-331d41423f4d"
 Plots = "91a5bcdd-55d7-5caf-9e0b-520d859cae80"

docs/src/lecture_08/graphdiff_6.svg

@@ -24,6 +24,7 @@
     \foreach \source/\dest in {
       {h1/h3},
       {h2/h3},
+      {h3/z},
       {x/h1},
       {y/h2},
       {x/h2}} \path[edge] (\source) -- (\dest);