# Package org.apache.commons.math3.util

Convenience routines and common data structures used throughout the commons-math library.

See: Description

- Interface Summary
  Interface | Description
  --- | ---
  DoubleArray | Provides a standard interface for double arrays.
  Incrementor.MaxCountExceededCallback | Defines a method to be called at counter exhaustion.
  IterationListener | The listener interface for receiving events occurring in an iterative algorithm.
  MathArrays.Function | Real-valued function that operate on an array or a part of it.
  NumberTransformer | Subclasses implementing this interface can transform Objects to doubles.

- Class Summary
  Class | Description
  --- | ---
  ArithmeticUtils | Some useful, arithmetics related, additions to the built-in functions in `Math`.
  BigReal | Arbitrary precision decimal number.
  BigRealField | Representation of real numbers with arbitrary precision field.
  Combinations | Utility to create combinations `(n, k)` of `k` elements in a set of `n` elements.
  CombinatoricsUtils | Combinatorial utilities.
  CompositeFormat | Base class for formatters of composite objects (complex numbers, vectors ...).
  ContinuedFraction | Provides a generic means to evaluate continued fractions.
  Decimal64 | This class wraps a `double` value in an object.
  Decimal64Field | The field of double precision floating-point numbers.
  DefaultTransformer | A Default NumberTransformer for java.lang.Numbers and Numeric Strings.
  FastMath | Faster, more accurate, portable alternative to `Math` and `StrictMath` for large scale computation.
  Incrementor | Utility that increments a counter until a maximum is reached, at which point, the instance will by default throw a `MaxCountExceededException`.
  IterationEvent | The root class from which all events occurring while running an `IterationManager` should be derived.
  IterationManager | This abstract class provides a general framework for managing iterative algorithms.
  MathArrays | Arrays utilities.
  MathUtils | Miscellaneous utility functions.
  MultidimensionalCounter | Converter between unidimensional storage structure and multidimensional conceptual structure.
  OpenIntToDoubleHashMap | Open addressed map from int to double.
  OpenIntToFieldHashMap<T extends FieldElement<T>> | Open addressed map from int to FieldElement.
  Pair<K,V> | Generic pair.
  Precision | Utilities for comparing numbers.
  ResizableDoubleArray | A variable length `DoubleArray` implementation that automatically handles expanding and contracting its internal storage array as elements are added and removed.
  TransformerMap | This TansformerMap automates the transformation of mixed object types.

- Enum Summary
  Enum | Description
  --- | ---
  MathArrays.OrderDirection | Specification of ordering direction.
  MathArrays.Position | Specification for indicating that some operation applies before or after a given index.
  ResizableDoubleArray.ExpansionMode | Specification of expansion algorithm.

## Package org.apache.commons.math3.util Description

Convenience routines and common data structures used throughout the commons-math library.

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