# 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 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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