[R-SIG-Finance] Mixed integer programming

[Hannu Kahra]

I forgot to mention that I am using the ompr package. An example is given
here

https://blog.revolutionanalytics.com/2016/12/mixed-integer-programming-in-r-with-the-ompr-package.html

-Hannu

On Tue, Feb 19, 2019 at 2:10 PM Hannu Kahra <hkahra using gmail.com> wrote:

> I have tried to replicate Example 5.1 in Luenberger: Investment Science.
>
> Here is the model
> model <- MIPModel() %>%
>   add_variable(x[i], i = 1:7, type = "binary") %>%
>
> set_objective(200*x[1]+30*x[2]+200*x[3]+60*x[4]+50*x[5]+100*x[6]+50*x[7])
> %>%
>
> add_constraint(100*x[1]+20*x[2]+150*x[3]+50*x[4]+50*x[5]+150*x[6]+150*x[7]
> <= 500)
> solve_model(with_ROI("glpk",verbose = TRUE))
>
> I get the following error
>
> Error in UseMethod("solve_model") :
>   no applicable method for 'solve_model' applied to an object of class "function"
>
>  modelMixed integer linear optimization problem
> Variables:
>   Continuous: 0
>   Integer: 0
>   Binary: 7
> Model sense: maximize
> Constraints: 1
>
> What is wrong? Thank you in advance.
>
> -Hannu
>
>

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