org.apache.commons.math3.optim.nonlinear.scalar

## Class GradientMultivariateOptimizer

- java.lang.Object
- - org.apache.commons.math3.optim.BaseOptimizer<PAIR>
  - - org.apache.commons.math3.optim.BaseMultivariateOptimizer<PointValuePair>
    - - org.apache.commons.math3.optim.nonlinear.scalar.MultivariateOptimizer
      - - org.apache.commons.math3.optim.nonlinear.scalar.GradientMultivariateOptimizer

- Direct Known Subclasses:
    NonLinearConjugateGradientOptimizer

      public abstract class GradientMultivariateOptimizer
      extends MultivariateOptimizer

  Base class for implementing optimizers for multivariate scalar differentiable functions. It contains boiler-plate code for dealing with gradient evaluation.
  Since:
    3.1

- - ### Field Summary

    - ### Fields inherited from class org.apache.commons.math3.optim.BaseOptimizer

      `evaluations, iterations`

  - ### Constructor Summary

    Constructors
    Modifier | Constructor and Description
    --- | ---
    `protected` | `GradientMultivariateOptimizer(ConvergenceChecker<PointValuePair> checker)`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `protected double[]` | `computeObjectiveGradient(double[] params)` Compute the gradient vector.
    `PointValuePair` | `optimize(OptimizationData... optData)` Stores data and performs the optimization.
    `protected void` | `parseOptimizationData(OptimizationData... optData)` Scans the list of (required and optional) optimization data that characterize the problem.

    - ### Methods inherited from class org.apache.commons.math3.optim.nonlinear.scalar.MultivariateOptimizer

      `computeObjectiveValue, getGoalType`

    - ### Methods inherited from class org.apache.commons.math3.optim.BaseMultivariateOptimizer

      `getLowerBound, getStartPoint, getUpperBound`

    - ### Methods inherited from class org.apache.commons.math3.optim.BaseOptimizer

      `doOptimize, getConvergenceChecker, getEvaluations, getIterations, getMaxEvaluations, getMaxIterations, incrementEvaluationCount, incrementIterationCount, optimize`

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### GradientMultivariateOptimizer

          protected GradientMultivariateOptimizer(ConvergenceChecker<PointValuePair> checker)

      Parameters:
        `checker` - Convergence checker.

  - ### Method Detail

    - #### computeObjectiveGradient

          protected double[] computeObjectiveGradient(double[] params)

      Compute the gradient vector.
      Parameters:
        `params` - Point at which the gradient must be evaluated.
      Returns:
        the gradient at the specified point.

    - #### optimize

          public PointValuePair optimize(OptimizationData... optData)
                                  throws TooManyEvaluationsException

      Stores data and performs the optimization.

      The list of parameters is open-ended so that sub-classes can extend it with arguments specific to their concrete implementations.

      When the method is called multiple times, instance data is overwritten only when actually present in the list of arguments: when not specified, data set in a previous call is retained (and thus is optional in subsequent calls).

      Important note: Subclasses must override `BaseOptimizer.parseOptimizationData(OptimizationData[])` if they need to register their own options; but then, they must also call `super.parseOptimizationData(optData)` within that method.

      Overrides:
        `optimize` in class `MultivariateOptimizer`
      Parameters:
        `optData` - Optimization data. In addition to those documented in `MultivariateOptimizer`, this method will register the following data:
        - `ObjectiveFunctionGradient`
      Returns:
        a point/value pair that satisfies the convergence criteria.
      Throws:
        `TooManyEvaluationsException` - if the maximal number of evaluations (of the objective function) is exceeded.

    - #### parseOptimizationData

          protected void parseOptimizationData(OptimizationData... optData)

      Scans the list of (required and optional) optimization data that characterize the problem.
      Overrides:
        `parseOptimizationData` in class `MultivariateOptimizer`
      Parameters:
        `optData` - Optimization data. The following data will be looked for:
        - `ObjectiveFunctionGradient`

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