Error with set_start_value_function and Parameter Function Call

[DarioSlaifsteinSk]

I encountered an error when trying to set the start value function for an infinite variable using a parameter function. The error message suggests an incorrect syntax when calling the parameter function within the anonymous function passed to set_start_value_function.

Code Snippet (Illustrative):

function spvSzg!(model::InfiniteModel, data::Dict, sets::modelSettingsRFO)
    # ... (Parameter function definition) ...
   pvData = data["pv"] # is an array
   Dt = supports(t) 
    @parameter_function(model, PpvMPPT[w ∈ 1:Nw] == (t) -> pvData[zero_order_time_index(Dt,t), w])

    # ... (Infinite variable definition) ...
    @variable(model, Ppv[w ∈ 1:Nw] .≥ 0, Infinite(t))

    # Attempt to set start value function (causes error)
    [set_start_value_function(Ppv[w], t -> 5 * PpvMPPT[w](t)) for w ∈ 1:Nw]

    # ... (Rest of the model definition) ...
end

the error occurs when optimize!(model) creates the transcription model

Functional call `PpvMPPT[1](t)(1.0)` is unrecognized syntax.

as if the transcription is not evaluating the PpvMPPT function over t but over something else.
In this case w is an scenario index, so Ppv has a different trajectory for each scenario
any ideas?
kind regards,

[pulsipher]

Hi @DarioSlaifsteinSk,

When using set_start_value_function, you need to directly pass the Julia function in question, not a parameter function. So in this case you should write something like:

for w ∈ 1:Nw
   set_start_value_function(Ppv[w], t -> 5 * pvData[zero_order_time_index(Dt,t), w])
end

[DarioSlaifsteinSk]

of course! damn, I was reusing the wrong line of code