Using interpolating functions in constraints with derivatives

[notesofdabbler]

I am trying a toy ODE problem of simulating volume in a tank when flowrate into the tank follows a set time profile. I was putting a constraint of the following form which gave the error below (qint(t) is an interpolation function)

The notebook which has this example is in this location. I wanted to check if using interpolation functions is not currently supported.

[pulsipher]

For functions that depend only on infinite parameters such as this one, we can use the parameter function syntax (https://pulsipher.github.io/InfiniteOpt.jl/stable/guide/expression/#par_func_docs). In this case you can do:

@parameter_function(m, qint_func == t -> qint(t))
@constraint(m, deriv(V, t) == qint_func)

[notesofdabbler]

Thanks, that fixed it.