Function appraise_investment 

pub fn appraise_investment(
    model: &Model,
    asset: &AssetRef,
    max_capacity: Option<AssetCapacity>,
    commodity: &Commodity,
    objective_type: &ObjectiveType,
    coefficients: &Rc<ObjectiveCoefficients>,
    demand: &IndexMap<TimeSliceID, Flow>,
) -> Result<AppraisalOutput>

Appraise the given investment with the specified objective type.

Returns

The AppraisalOutput produced by the selected appraisal method. The metric field is comparable with other appraisals of the same type (npv/lcox).