Getting nicer symbolic representations

[RicardRC]

Hello! Thanks for the package.
Is there any way of obtaining the correct parameter names from the report? I would like to pass the array of names as third parameter to node_to_symbolic(...) to get recognizable parameters after processing the symbolic version further. Currently I'm getting x1, x2, etc. I've seen that printing the whole report, there's a variable_names vector. But I can't find how to access it as a julia newbie.

equations = Expression{Float64, DynamicExpressions.NodeModule.Node{Float64}, @NamedTuple{operators::DynamicExpressions.OperatorEnumModule.OperatorEnum{Tuple{typeof(+), typeof(-), typeof(*), typeof(/), typeof(safe_pow), typeof(rem), typeof(/)}, Tuple{typeof(square), typeof(safe_sqrt), typeof(neg), typeof(exp), typeof(safe_sqrt), typeof(safe_log), typeof(safe_log2), typeof(safe_log10), typeof(inv), typeof(abs), typeof(sign)}}, variable_names::Vector{String}}}[...]

[MilesCranmer]

Oh you can get the variables names with

using SymbolicRegression: get_variable_names
eq = equations[end]
vars = get_variable_names(eq)

This is the “proper” generic way, but you can also just do

eq.metadata.variable_names

[RicardRC]

• using get_variable_names(eq) gets me ERROR: UndefVarError: get_variable_namesnot defined inMain``

• Using node_to_symbolic(eq, model, eq.metadata.variable_names) gets me a "Please load SymbolicUtils" (which is loaded, so something else is wrong), but at least the displayed result I get is a vector of Symbol names, so I guess now there's only figuring out what is the exact signature of node_to_symbolic.

[RicardRC]

Yeah, it was my unfamiliarity with julia. Luckily you have test_symbolic_utils.jl in here which helped me find the proper way.

eqs = node_to_symbolic(eq, model, variable_names=eq.metadata.variable_names)
display(eqs)

This worked fine! Thank you again!

[MilesCranmer]

Although, the node_to_symbolic should automatically extract the variable names. If not we should fix it

[RicardRC]

It currently does not, at least not to me. Maybe I'm doing something wrong?

[MilesCranmer]

It could be I just forgot to merge that feature! I'll try to take a look.

[MilesCranmer]

Ok should be fixed by this: SymbolicML/DynamicExpressions.jl#117