functions to find nodes from dofs and vice versa

test/test_node_dof_mapping.jl

@@ -0,0 +1,21 @@
+# This file is a part of JuliaFEM.
+# License is MIT: see https://github.com/JuliaFEM/JuliaFEM.jl/blob/master/LICENSE.md
+
+using JuliaFEM.Test
+
+using JuliaFEM.Core: find_dofs_by_nodes, find_nodes_by_dofs
+
+@testset "find dofs given a set of nodes" begin
+    nodes = [1, 3]
+    dim = 3
+    dofs = find_dofs_by_nodes(dim, nodes)
+    @test dofs == [1, 2, 3, 7, 8, 9]
+end
+
+@testset "find nodes given a set of dofs" begin
+    dofs = [2, 8, 9]
+    dim = 3
+    nodes = find_nodes_by_dofs(dim, dofs)
+    @test nodes == [1, 3]
+end
+