Hello team, I would like to print the values of the constraints(disT, cosT, & deaTH) of my model below. I used the following immediate commands, but it is not working. I am using Julia v0.6.4. I shall be grateful for your help. Thanks in advance. println("Constraint disT \n:", getvalue(disT)) pri…

Please read the first post of Please read: make it easier to help you - #11 to learn how to format your code. In addition, please update to Julia 1.X and the latest version of JuMP. Then you can use value(cosT). Here is the relevant documentation: Query Solutions · JuMP .

Thanks for the reference, Odow. I missed one of the triple-backticks in the beginning of my sample code. I have edited the previous post per the PSA requirements. I hope this helps. Thanks again for your assistance.

Hi odow, I followed the instructions like you recommended, and also read the documentation at - Query Solutions · JuMP - but I still keep getting errors when I try to print/access the values of the constraints of my model. At this point, I am unsure what I am doing wrong. I shall, therefore, very mu…

Running your code with julia> versioninfo() Julia Version 1.4.1 Commit 381693d3df* (2020-04-14 17:20 UTC) Platform Info: OS: Linux (x86_64-pc-linux-gnu) CPU: Intel(R) Core(TM) i7-6700HQ CPU @ 2.60GHz WORD_SIZE: 64 LIBM: libopenlibm LLVM: libLLVM-8.0.1 (ORCJIT, skylake) (tmp) pkg> st Stat…

Take another read of Please read: make it easier to help you - #11 . In particular, your code doesn’t show how you are calling value on the constraints you haven’t provided the error message you are seeing

Hi odow, Sorry I missed including the printing methods and the associated error examples. Kindly see below how I am trying to print the values of the constraints and the associated error messages. Thank you again for your help. julia> JuMP.value(DIST) ERROR: `JuMP.value` is not defined for collect…

I still can’t run your code because I don’t know what DIST is, and I don’t know when you called value. Since you got an OPTIMIZE_NOT_CALLED error, you probably called value before optimize!. This code has lots of issues: for (key, value) in w @constraints(m, begin (DIST=value*(sum(dist[i,j]*x[i,…

Odow, kindly see my response to your questions below: Are you trying to name constraints? Adding (DIST = ... is not the right syntax → Yes, I am trying to name the constraints by following this example - con = @constraint(model, 2x <= 1) - at Constraints · JuMP documentation. If I use the first…

You probably want to do instead: f(i, j) = i != j ? 0.3 : 0.7 DIST = @constraint(m, (sum(f(i, j) * dist[i,j] * x[i,j] for i=1:V, j=1:V) - 29) / 29 <= Q) optimize!(m) value.(DIST) Otherwise, you are not creating only one constraint but several ones, one for each entry of w. From v = value.(DIST), …

You should first fix the model so that it’s correct. It seems like you expect a single DIST constraint, but the way the for loop is set up, it’s creating a new “DIST” constraint for every (key, value) in w. If you run with V = 3, you’ll see that the model has 27 constraints, not 3 as I’m guessing is…

How to print the values of constraints

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How to print the values of constraints

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