KeLPie: The Human Linear Program Library

KeLPie is a Kotlin linear program library which allows you to create complicated, functional, non-canonical linear programs with ease.

Usage in 19 lines of code:

// Example problem from Professor James Jones at Richland University
// URL: https://people.richland.edu/james/ictcm/2006/

import krilis.solver.*

fun main() {
    val x1 = ContinuousVar("x1")
    val x2 = ContinuousVar("x2")
    val solution = LpSolver(
            maximize = 40.0*x1 + 30.0*x2,
            subjectTo = arrayListOf(
                    LteConstraint(x1 + 2.0*x2, 16.0),
                    LteConstraint(x1 + x2, 9.0),
                    LteConstraint(3.0*x1 + 2.0*x2, 24.0),
                    GteConstraint(x1.toLinearExpr(), 0.0),
                    GteConstraint(x2.toLinearExpr(), 0.0)
            )
    ).simplexSolve()
    if (solution is OptimalSolution) {
        println(solution.getValue(x1))
        // Prints "6.0"
    }
}

A more detailed tutorial can be found here.

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FAQ

Q: What does KeLPie stand for?

A: Kotlin e Linear Program interface.