val ds_urban = List(List(Some(-0.03573991804411003), Some(0.539974575389325)), List(Some(0.10103414222249969), Some(0.24777764141006836))) assert(M1.yearly_yield(ds_urban, 100, 0) == 125) assert(M1.yearly_yield(ds_urban, 100, 1) == 117)