Package 'ROI.plugin.quadprog'

Quadratic Problem 1

Description

$maximize \ \ x_1^2 + x_2^2 + x_3^2 - 5 x_2$

$subject \ to:$

$-4 x_1 - 3 x_2 + \geq -8$

$2 x_1 + x_2 + \geq 2$

$- 2 x_2 + x_3 \geq 0$

$x_1, x_2, x_3 \geq 0$

Examples

require("ROI")
A <- cbind(c(-4, -3, 0), 
           c( 2,  1, 0), 
           c( 0, -2, 1))
x <- OP(Q_objective(diag(3), L =  c(0, -5, 0)),
        L_constraint(L = t(A),
                     dir = rep(">=", 3),
                     rhs = c(-8, 2, 0)))

opt <- ROI_solve(x, solver="quadprog")
opt
## Optimal solution found.
## The objective value is: -2.380952e+00
solution(opt)
## [1]  0.4761905 1.0476190 2.0952381

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