# Header
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## org.jfree.data
Class DataUtilities

    java.lang.Object
      org.jfree.data.DataUtilities

    public abstract class DataUtilities

extends java.lang.Object

Utility methods for use with some of the data classes (but not the datasets, see `DatasetUtilities`).

Constructor Summary
`DataUtilities()`

Method Summary
`static double` `calculateColumnTotal(Values2D data, int column)` Returns the total of the values in one column of the supplied data table.
`static double` `calculateColumnTotal(Values2D data, int column, int[] validRows)` Returns the total of the values in one column of the supplied data table by taking only the row numbers in the array into account.
`static double` `calculateRowTotal(Values2D data, int row)` Returns the total of the values in one row of the supplied data table.
`static double` `calculateRowTotal(Values2D data, int row, int[] validCols)` Returns the total of the values in one row of the supplied data table by taking only the column numbers in the array into account.
`static double[][]` `clone(double[][] source)` Returns a clone of the specified array.
`static java.lang.Number[]` `createNumberArray(double[] data)` Constructs an array of `Number` objects from an array of `double` primitives.
`static java.lang.Number[][]` `createNumberArray2D(double[][] data)` Constructs an array of arrays of `Number` objects from a corresponding structure containing `double` primitives.
`static boolean` `equal(double[][] a, double[][] b)` Tests two arrays for equality.
`static KeyedValues` `getCumulativePercentages(KeyedValues data)` Returns a `KeyedValues` instance that contains the cumulative percentage values for the data in another `KeyedValues` instance.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### DataUtilities

    public DataUtilities()

Method Detail

### equal

    public static boolean equal(double[][] a,
                                double[][] b)

  Tests two arrays for equality. To be considered equal, the arrays must have exactly the same dimensions, and the values in each array must also match (two values that qre both NaN or both INF are considered equal in this test).

  Parameters:
    `a` - the first array (`null` permitted).
    `b` - the second array (`null` permitted).
  Returns:
    A boolean.
  Since:
    1.0.13

### clone

    public static double[][] clone(double[][] source)

  Returns a clone of the specified array.

  Parameters:
    `source` - the source array (`null` not permitted).
  Returns:
    A clone of the array.
  Since:
    1.0.13

### calculateColumnTotal

    public static double calculateColumnTotal(Values2D data,
                                              int column)

  Returns the total of the values in one column of the supplied data table.

  Parameters:
    `data` - the table of values (`null` not permitted).
    `column` - the column index (zero-based).
  Returns:
    The total of the values in the specified column.

### calculateColumnTotal

    public static double calculateColumnTotal(Values2D data,
                                              int column,
                                              int[] validRows)

  Returns the total of the values in one column of the supplied data table by taking only the row numbers in the array into account.

  Parameters:
    `data` - the table of values (`null` not permitted).
    `column` - the column index (zero-based).
    `validRows` - the array with valid rows (zero-based).
  Returns:
    The total of the valid values in the specified column.
  Since:
    1.0.13

### calculateRowTotal

    public static double calculateRowTotal(Values2D data,
                                           int row)

  Returns the total of the values in one row of the supplied data table.

  Parameters:
    `data` - the table of values (`null` not permitted).
    `row` - the row index (zero-based).
  Returns:
    The total of the values in the specified row.

### calculateRowTotal

    public static double calculateRowTotal(Values2D data,
                                           int row,
                                           int[] validCols)

  Returns the total of the values in one row of the supplied data table by taking only the column numbers in the array into account.

  Parameters:
    `data` - the table of values (`null` not permitted).
    `row` - the row index (zero-based).
    `validCols` - the array with valid cols (zero-based).
  Returns:
    The total of the valid values in the specified row.
  Since:
    1.0.13

### createNumberArray

    public static java.lang.Number[] createNumberArray(double[] data)

  Constructs an array of `Number` objects from an array of `double` primitives.

  Parameters:
    `data` - the data (`null` not permitted).
  Returns:
    An array of `Double`.

### createNumberArray2D

    public static java.lang.Number[][] createNumberArray2D(double[][] data)

  Constructs an array of arrays of `Number` objects from a corresponding structure containing `double` primitives.

  Parameters:
    `data` - the data (`null` not permitted).
  Returns:
    An array of `Double`.

### getCumulativePercentages

    public static KeyedValues getCumulativePercentages(KeyedValues data)

  Returns a `KeyedValues` instance that contains the cumulative percentage values for the data in another `KeyedValues` instance.

  The percentages are values between 0.0 and 1.0 (where 1.0 = 100%).

  Parameters:
    `data` - the data (`null` not permitted).
  Returns:
    The cumulative percentages.

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