fix: fix "mathtt{}" symbolic bug (#292)

Project.toml

@@ -58,8 +58,8 @@ Plots = "1.39"
 PrecompileTools = "1.2"
 ProgressMeter = "1.7.2"
 SteadyStateDiffEq = "2.3.2"
-SymbolicUtils = "3.7"
-Symbolics = "~6.14"
+SymbolicUtils = "3.5"
+Symbolics = "6.4"
 julia = "1.10.0"
 
 [extras]

src/HarmonicVariable.jl

@@ -77,9 +77,10 @@ function declare_variable(name::String, independent_variable::Num)
 end
 
 "Return the name of a variable (excluding independent variables)"
-function var_name(x::Num)
+function var_name(x::Num)::String
     var = Symbolics._toexpr(x)
-    return var isa Expr ? String(var.args[1]) : String(var)
+    var = var isa Expr ? String(var.args[1]) : String(var)
+    return String(replace(var, r"\\mathtt\{([^}]*)\}" => s"\1"))
+    # ^ remove "\\mathtt{}" from the variable name coming from Symbolics since Symbolics v6.14.1 (Symbolics#1305)
 end
-#  var_name(x::Term) = String(Symbolics._toexpr(x).args[1])
 var_name(x::SymbolicUtils.Sym) = String(x.name)

test/HarmonicVariable.jl

@@ -5,69 +5,10 @@ using HarmonicBalance
 diff_eq = DifferentialEquation(
     d(x, t, 2) + ω0 * x + α * x^3 + γ * d(x, t) + η * x^2 * d(x, t) ~ F * cos(ω * t), x
 ) # define ODE
+add_harmonic!(diff_eq, x, ω)
+harmonic_eq = get_harmonic_equations(diff_eq)
 
-add_harmonic!(diff_eq, x, ω) # specify the ansatz x = u(T) cos(ωt) + v(T) sin(ωt)
-
-harmonic_eq = get_harmonic_equations(diff_eq) # implement ansatz to get harmonic equations
-get_variables(harmonic_eq)
-
-# @testset "HarmonicVariable Tests" begin
-#     # Test display function
-#     @testset "Display" begin
-#         var = HarmonicVariable(:x, "x", "u", 1.0, 2.0)
-#         @test display(var) == :x
-#         vars = [
-#             HarmonicVariable(:x, "x", "u", 1.0, 2.0),
-#             HarmonicVariable(:y, "y", "v", 2.0, 3.0),
-#         ]
-#         @test display(vars) == [:x, :y]
-#     end
-
-#     # Test _coordinate_transform function
-#     @testset "_coordinate_transform" begin
-#         @test _coordinate_transform(2.0, 1.0, 0.0, "u") == 2.0
-#         @test _coordinate_transform(2.0, 1.0, 0.0, "v") == 0.0
-#         @test _coordinate_transform(2.0, 1.0, 0.0, "a") == 2.0
-#     end
-
-#     # Test _create_harmonic_variable function
-#     @testset "_create_harmonic_variable" begin
-#         rule, hvar = _create_harmonic_variable(2.0, 1.0, 0.0, "u"; new_symbol="x")
-#         @test rule == 2.0
-#         @test hvar == HarmonicVariable(:x, "u_{2.0}", "u", 1.0, 2.0)
-#     end
-
-#     # Test substitute_all function
-#     @testset "substitute_all" begin
-#         eq = 2.0 * :x + 3.0 * :y
-#         rules = Dict(:x => 1.0, :y => 2.0)
-#         @test substitute_all(eq, rules) == 2.0 + 6.0
-#         var = HarmonicVariable(:x, "x", "u", 1.0, 2.0)
-#         @test substitute_all(var, rules) == HarmonicVariable(1.0, "x", "u", 1.0, 2.0)
-#         vars = [
-#             HarmonicVariable(:x, "x", "u", 1.0, 2.0),
-#             HarmonicVariable(:y, "y", "v", 2.0, 3.0),
-#         ]
-#         @test substitute_all(vars, rules) == [
-#             HarmonicVariable(1.0, "x", "u", 1.0, 2.0),
-#             HarmonicVariable(2.0, "y", "v", 2.0, 3.0),
-#         ]
-#     end
-
-#     # Test Symbolics.get_variables function
-#     @testset "Symbolics.get_variables" begin
-#         vars = [1.0, 2.0, 3.0]
-#         @test Symbolics.get_variables(vars) == [1.0, 2.0, 3.0]
-#         var = HarmonicVariable(:x, "x", "u", 1.0, 2.0)
-#         @test Symbolics.get_variables(var) == [:x]
-#     end
-
-#     # Test isequal function
-#     @testset "isequal" begin
-#         var1 = HarmonicVariable(:x, "x", "u", 1.0, 2.0)
-#         var2 = HarmonicVariable(:x, "x", "u", 1.0, 2.0)
-#         var3 = HarmonicVariable(:y, "y", "v", 2.0, 3.0)
-#         @test isequal(var1, var2) == true
-#         @test isequal(var1, var3) == false
-#     end
-# end
+@testset "" begin
+    vars = get_variables(harmonic_eq)
+    @test HarmonicBalance.var_name.(vars) == ["u1", "v1"]
+end