Class AbstractLeastSquaresOptimizer

Method Details

• computeWeightedJacobian

  protected RealMatrix computeWeightedJacobian(double[] params)

  Deprecated.

  Computes the weighted Jacobian matrix.

  Parameters:

  params - Model parameters at which to compute the Jacobian.

  Returns:

  the weighted Jacobian: W^1/2 J.

  Throws:

  DimensionMismatchException - if the Jacobian dimension does not match problem dimension.

• computeCost

  protected double computeCost(double[] residuals)

  Deprecated.

  Computes the cost.

  Parameters:

  residuals - Residuals.

  Returns:

  the cost.

  See Also:

  • computeResiduals(double[])

• getRMS

  public double getRMS()

  Deprecated.

  Gets the root-mean-square (RMS) value. The RMS the root of the arithmetic mean of the square of all weighted residuals. This is related to the criterion that is minimized by the optimizer as follows: If c if the criterion, and n is the number of measurements, then the RMS is sqrt (c/n).

  Returns:

  the RMS value.

• getChiSquare

  public double getChiSquare()

  Deprecated.

  Get a Chi-Square-like value assuming the N residuals follow N distinct normal distributions centered on 0 and whose variances are the reciprocal of the weights.

  Returns:

  chi-square value

• getWeightSquareRoot

  public RealMatrix getWeightSquareRoot()

  Deprecated.

  Gets the square-root of the weight matrix.

  Returns:

  the square-root of the weight matrix.

• setCost

  protected void setCost(double cost)

  Deprecated.

  Sets the cost.

  Parameters:

  cost - Cost value.

• computeCovariances

  public double[][] computeCovariances(double[] params, double threshold)

  Deprecated.

  Get the covariance matrix of the optimized parameters.
  Note that this operation involves the inversion of the JTJ matrix, where J is the Jacobian matrix. The threshold parameter is a way for the caller to specify that the result of this computation should be considered meaningless, and thus trigger an exception.

  Parameters:

  params - Model parameters.

  threshold - Singularity threshold.

  Returns:

  the covariance matrix.

  Throws:

  SingularMatrixException - if the covariance matrix cannot be computed (singular problem).

• computeSigma

  public double[] computeSigma(double[] params, double covarianceSingularityThreshold)

  Deprecated.

  Computes an estimate of the standard deviation of the parameters. The returned values are the square root of the diagonal coefficients of the covariance matrix, sd(a[i]) ~= sqrt(C[i][i]), where a[i] is the optimized value of the i-th parameter, and C is the covariance matrix.

  Parameters:

  params - Model parameters.

  covarianceSingularityThreshold - Singularity threshold (see computeCovariances).

  Returns:

  an estimate of the standard deviation of the optimized parameters

  Throws:

  SingularMatrixException - if the covariance matrix cannot be computed.

• optimize

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

  Deprecated.

  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 JacobianMultivariateVectorOptimizer

  Parameters:

  optData - Optimization data. In addition to those documented in JacobianMultivariateVectorOptimizer, this method will register the following data:

  • Weight

  Returns:

  a point/value pair that satisfies the convergence criteria.

  Throws:

  TooManyEvaluationsException - if the maximal number of evaluations is exceeded.

  DimensionMismatchException - if the initial guess, target, and weight arguments have inconsistent dimensions.

• computeResiduals

  protected double[] computeResiduals(double[] objectiveValue)

  Deprecated.

  Computes the residuals. The residual is the difference between the observed (target) values and the model (objective function) value. There is one residual for each element of the vector-valued function.

  Parameters:

  objectiveValue - Value of the the objective function. This is the value returned from a call to computeObjectiveValue (whose array argument contains the model parameters).

  Returns:

  the residuals.

  Throws:

  DimensionMismatchException - if params has a wrong length.

• parseOptimizationData

  protected void parseOptimizationData(OptimizationData... optData)

  Deprecated.

  Scans the list of (required and optional) optimization data that characterize the problem. If the weight matrix is specified, the weightMatrixSqrt field is recomputed.

  Overrides:

  parseOptimizationData in class JacobianMultivariateVectorOptimizer

  Parameters:

  optData - Optimization data. The following data will be looked for:

  • Weight