The main problem is that my variables would be determined only after running the codes (because the number of variables is not fixed).
In old version ModelingToolkit.jl, I used the following codes to generate a variable.
my_var = Variable(Symbol(name))(t) # name is a string
However, it can’t work in the latest version. Here is the error.
ERROR: Sym name is not callable. Use @syms name(var1, var2,...) to create it as a callable.
I've checked SymbolicUtils.jl but didn't find other usages. How can I fix this problem?
You can use the @variables macro to create symbolic variables at runtime as well. The $ operator interpolates the runtime value.
julia> using ModelingToolkit
julia> z = :abc;
julia> k = @variables $z
1-element Vector{Num}:
abc
julia> k[1]
abc