[SCIP+AMPL] Correspondence between decision variable names and values?

[JC]

After running the example 6 presented here: https://www.inverseproblem.co.nz/OPTI/index.php/File/AMPL,

I obtain a vector with the solution for each decision variable specified in the AMPL model file:

solution =

     3
     2
     0
     4
     3
     0
     1
     1

How can one find the correspondence between the values obtained and the names specified in the model file, i.e, which value corresponds to which variable? 

[Jonathan Currie]

I'm unfortunately away on holiday at the moment and don't have access to MATLAB, but I believe solving an AMPL problem also generates a .sol (solution) file in the current directory which should contain this information? Otherwise from memory AMPL reorders variables based on integer/continuous/binary I think. This document may help a bit: https://ampl.com/REFS/hooking2.pdf

Apologies this should be a simple answer but I don't have the information in front of me at the moment!

Jonathan

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[Jorge Miguel Cordeiro]

The .sol (solution) file generated also does not contain the decision variables names, only their values.

I found a way to work around this issue, which is satisfactory for me, but maybe not the easier way of doing things.

After solving the problem in MATLAB, I go to the command window of AMPL. There I load the model, the data and the solution files. Then, I input this command: printf {i in 1.._nvars} "%s= %.16f\n", _varname[i], _var[i] > ("OUTPUT" & ".out");, which generates me a new .out (output) file with the variables names and values.

Thanks a lot for answering Jonathan.