scalation.minima

Minimizer

Related Doc: package minima

trait Minimizer extends AnyRef

This trait sets the pattern for optimization algorithms for solving Non-Linear Programming (NLP) problems of the form:

minimize f(x) subject to g(x) <= 0 [ optionally g(x) == 0 ]

where f is the objective function to be minimized g is the constraint function to be satisfied, if any

Classes mixing in this trait must implement a function (fg) that rolls the constraints into the objective functions as penalties for constraint violation, a one-dimensional Line Search (LS) algorithm (lineSearch) and an iterative method (solve) that searches for improved solutions (x-vectors with lower objective function values (f(x)).

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Abstract Value Members

  1. abstract def lineSearch(x: VectorD, dir: VectorD, step: Double = STEP): Double

    Perform an exact (e.g., GoldenSectionLS) or inexact (e.g., WolfeLS) line search.

    Perform an exact (e.g., GoldenSectionLS) or inexact (e.g., WolfeLS) line search. Search in direction 'dir', returning the distance 'z' to move in that direction.

    x

    the current point

    dir

    the direction to move in

    step

    the initial step size

  2. abstract def solve(x0: VectorD, step: Double = STEP, toler: Double = EPSILON): VectorD

    Solve the Non-Linear Programming (NLP) problem by starting at 'x0' and iteratively moving down in the search space to a minimal point.

    Solve the Non-Linear Programming (NLP) problem by starting at 'x0' and iteratively moving down in the search space to a minimal point.

    x0

    the starting point

    step

    the initial step size

    toler

    the tolerance

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  4. val EPSILON: Double

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  5. val MAX_ITER: Int

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  6. val STEP: Double

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  7. val TOL: Double

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  11. def equals(arg0: Any): Boolean

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  12. def fg(x: VectorD): Double

    The objective function f plus a weighted penalty based on the constraint function g.

    The objective function f plus a weighted penalty based on the constraint function g. Override for constrained optimization and ignore for unconstrained optimization.

    x

    the coordinate values of the current point

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