我想在使用ROI包进行优化时定义变量的边界。我使用OP函数来构造优化问题对象。
默认值为:下限等于零,上限等于+无穷大。
以下是一个效果良好的示例代码:
LP <- OP( c(2, 4, 3),
L_constraint(L = matrix(c(3, 2, 1, 4, 1, 3, 2, 2, 2), nrow = 3),
dir = c("<=", "<=", "<="),
rhs = c(60, 40, 80)),
max = TRUE )
但是,如果我手动添加边界&#34;&#34;我收到一个错误:
LP <- OP( c(2, 4, 3),
L_constraint(L = matrix(c(3, 2, 1, 4, 1, 3, 2, 2, 2), nrow = 3),
dir = c("<=", "<=", "<="),
rhs = c(60, 40, 80)),
bounds = list(upper=c(100,100,100), lower=c(0,0,0)),
max = TRUE )
Error in UseMethod("as.V_bound") :
no applicable method for 'as.V_bound' applied to an object of class "list"
但是描述说&#34;界限&#34;需要一个列表作为输入。
有没有人想过如何正确地将边界传递给OP函数?
答案 0 :(得分:1)
LP <- OP(c(2, 4, 3),
L_constraint(L = matrix(c(3, 2, 1, 4, 1, 3, 2, 2, 2), nrow = 3),
dir = c("<=", "<=", "<="),
rhs = c(60, 40, 80)),
bounds = V_bound(ui = seq_len(3), ub = rep.int(100, 3)),
maximum = TRUE )