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org.jfree.data

Class 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).

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
calculateRowTotal(Values2D data, int row)
Returns the total of the values in one row of the supplied data table.
static Number[]
createNumberArray(double[] data)
Constructs an array of Number objects from an array of double primitives.
static Number[][]
createNumberArray2D(double[][] data)
Constructs an array of arrays of Number objects from a corresponding structure containing double primitives.
static KeyedValues
getCumulativePercentages(KeyedValues data)
Returns a KeyedValues instance that contains the cumulative percentage values for the data in another KeyedValues instance.

Method Details

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.

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.

createNumberArray

public static 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 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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