Objects from the following classes can be coerced to "OP": "NULL", and "numeric". The former represents an empty optimization problem, the latter an unconstrained linear programming problem where the elements of a "numeric" vector c are treated as being objective variable coefficients in c^\top x). inherits from class
从下面的类的对象可以强制"OP":"NULL"和"numeric"。前者是指一个空的优化问题,后者是一个无约束的线性规划问题的元素"numeric"向量c被视为c^\top x目标变量的系数)。从类继承