org.apache.commons.math3.util

## Class MultidimensionalCounter

- java.lang.Object
- - org.apache.commons.math3.util.MultidimensionalCounter

- All Implemented Interfaces:
    Iterable<Integer>

      public class MultidimensionalCounter
      extends Object
      implements Iterable<Integer>

  Converter between unidimensional storage structure and multidimensional conceptual structure. This utility will convert from indices in a multidimensional structure to the corresponding index in a one-dimensional array. For example, assuming that the ranges (in 3 dimensions) of indices are 2, 4 and 3, the following correspondences, between 3-tuples indices and unidimensional indices, will hold:
  - (0, 0, 0) corresponds to 0
  - (0, 0, 1) corresponds to 1
  - (0, 0, 2) corresponds to 2
  - (0, 1, 0) corresponds to 3
  - ...
  - (1, 0, 0) corresponds to 12
  - ...
  - (1, 3, 2) corresponds to 23
  Since:
    2.2

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Class and Description
    --- | ---
    `class` | `MultidimensionalCounter.Iterator` Perform iteration over the multidimensional counter.

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `MultidimensionalCounter(int... size)` Create a counter.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `int` | `getCount(int... c)` Convert to unidimensional counter.
    `int[]` | `getCounts(int index)` Convert to multidimensional counter.
    `int` | `getDimension()` Get the number of dimensions of the multidimensional counter.
    `int` | `getSize()` Get the total number of elements.
    `int[]` | `getSizes()` Get the number of multidimensional counter slots in each dimension.
    `MultidimensionalCounter.Iterator` | `iterator()` Create an iterator over this counter.
    `String` | `toString()`

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

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

- - ### Constructor Detail

    - #### MultidimensionalCounter

          public MultidimensionalCounter(int... size)
                                  throws NotStrictlyPositiveException

      Create a counter.
      Parameters:
        `size` - Counter sizes (number of slots in each dimension).
      Throws:
        `NotStrictlyPositiveException` - if one of the sizes is negative or zero.

  - ### Method Detail

    - #### iterator

          public MultidimensionalCounter.Iterator iterator()

      Create an iterator over this counter.
      Specified by:
        `iterator` in interface `Iterable<Integer>`
      Returns:
        the iterator.

    - #### getDimension

          public int getDimension()

      Get the number of dimensions of the multidimensional counter.
      Returns:
        the number of dimensions.

    - #### getCounts

          public int[] getCounts(int index)
                          throws OutOfRangeException

      Convert to multidimensional counter.
      Parameters:
        `index` - Index in unidimensional counter.
      Returns:
        the multidimensional counts.
      Throws:
        `OutOfRangeException` - if `index` is not between `0` and the value returned by `getSize()` (excluded).

    - #### getCount

          public int getCount(int... c)
                       throws OutOfRangeException,
                              DimensionMismatchException

      Convert to unidimensional counter.
      Parameters:
        `c` - Indices in multidimensional counter.
      Returns:
        the index within the unidimensionl counter.
      Throws:
        `DimensionMismatchException` - if the size of `c` does not match the size of the array given in the constructor.
        `OutOfRangeException` - if a value of `c` is not in the range of the corresponding dimension, as defined in the `constructor`.

    - #### getSize

          public int getSize()

      Get the total number of elements.
      Returns:
        the total size of the unidimensional counter.

    - #### getSizes

          public int[] getSizes()

      Get the number of multidimensional counter slots in each dimension.
      Returns:
        the sizes of the multidimensional counter in each dimension.

    - #### toString

          public String toString()

      Overrides:
        `toString` in class `Object`

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