AMPL to Julia

Specific Domains Optimization (Mathematical)
1

Hello,

I am trying to convert an AMPL file to Julia and I dont know how to get started I have the following expressions that I need help with so I can use them as a reference to get started, the second one should be a for loop from my understanding, also what are some useful resources

Expression 1
**param** BRMPPSC {t **in** initial..T} **default** 0

expression 2

**param** BRLOADINGMG {t **in** initial..T} := **if** BRCOM[t] = 15 **then** (<<665,667,669,671,673,675,677,679,681,683,685,687,689,691,693,695;2.19912781954887,2.19912781954887,4.13499999999999,4.13999999999999,4.13499999999999,4.13999999999999,4.13499999999999,4.13499999999999,4.13499999999999,3.34000000000003,2.70500000000004,2.70499999999993,2.71000000000004,2.70500000000004,2.70499999999993,2.71000000000004,2.70500000000004>> FB['BR',t])

**else** **if** BRCOM[t] = 7 **then** (<<665,667,669,671,673,675,677,679,681,683,685,687,689,691,693,695;1.6689022556391,1.6689022556391,3.13499999999999,3.13499999999999,3.1400000000001,3.13499999999999,3.13499999999999,2.35000000000002,2.02499999999998,2.02999999999997,2.02999999999997,2.02999999999997,2.03000000000009,2.02499999999998,2.02999999999997,2.02999999999997,2.03000000000009>>FB['BR',t])

**else** 0;
2

I’ve never used AMPL, so can’t be of much help there, but I imagine the JuMP docs would be a good place start:

1 Like
3

Hi @Julianewbie, welcome to the forum :smile:

JuMP is a little different to AMPL. We don’t separate the data and the model, so for parameters, you can use regular data structures like arrays. For example, BRMPPSC = [0, 0, 0, 1, 2, 3, 0, 4].

I’m a little unsure what the second one means. You might need to provide more context from the model, like what BRCOM is, and what FB are, etc.

4

In case it helps, there’s also GitHub - JuliaSmoothOptimizers/AmplNLReader.jl: Julia AMPL Models Conforming to NLPModels.jl.