org.apache.commons.math3.fitting

## Class SimpleCurveFitter

- java.lang.Object
- - org.apache.commons.math3.fitting.AbstractCurveFitter
  - - org.apache.commons.math3.fitting.SimpleCurveFitter

-     public class SimpleCurveFitter
      extends AbstractCurveFitter

  Fits points to a user-defined `function`.
  Since:
    3.4

- - ### Nested Class Summary

    - ### Nested classes/interfaces inherited from class org.apache.commons.math3.fitting.AbstractCurveFitter

      `AbstractCurveFitter.TheoreticalValuesFunction`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `static SimpleCurveFitter` | `create(ParametricUnivariateFunction f, double[] start)` Creates a curve fitter.
    `protected LeastSquaresProblem` | `getProblem(Collection<WeightedObservedPoint> observations)` Creates a least squares problem corresponding to the appropriate curve.
    `SimpleCurveFitter` | `withMaxIterations(int newMaxIter)` Configure the maximum number of iterations.
    `SimpleCurveFitter` | `withStartPoint(double[] newStart)` Configure the start point (initial guess).

    - ### Methods inherited from class org.apache.commons.math3.fitting.AbstractCurveFitter

      `fit, getOptimizer`

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

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

- - ### Method Detail

    - #### create

          public static SimpleCurveFitter create(ParametricUnivariateFunction f,
                                 double[] start)

      Creates a curve fitter. The maximum number of iterations of the optimization algorithm is set to `Integer.MAX_VALUE`.
      Parameters:
        `f` - Function to fit.
        `start` - Initial guess for the parameters. Cannot be `null`. Its length must be consistent with the number of parameters of the function to fit.
      Returns:
        a curve fitter.
      See Also:
        `withStartPoint(double[])`, `withMaxIterations(int)`

    - #### withStartPoint

          public SimpleCurveFitter withStartPoint(double[] newStart)

      Configure the start point (initial guess).
      Parameters:
        `newStart` - new start point (initial guess)
      Returns:
        a new instance.

    - #### withMaxIterations

          public SimpleCurveFitter withMaxIterations(int newMaxIter)

      Configure the maximum number of iterations.
      Parameters:
        `newMaxIter` - maximum number of iterations
      Returns:
        a new instance.

    - #### getProblem

          protected LeastSquaresProblem getProblem(Collection<WeightedObservedPoint> observations)

      Creates a least squares problem corresponding to the appropriate curve.
      Specified by:
        `getProblem` in class `AbstractCurveFitter`
      Parameters:
        `observations` - Sample points.
      Returns:
        the least squares problem to use for fitting the curve to the given `points`.

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