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## hep.aida.ref
Class VariableAxis

    java.lang.Object
      hep.aida.ref.VariableAxis

All Implemented Interfaces:
  IAxis, Serializable

public class VariableAxis
extends Object
implements IAxis

Variable-width axis; A reference implementation of hep.aida.IAxis.

Version:
  1.0, 23/03/2000
See Also:
  Serialized Form

Field Summary

Fields inherited from interface hep.aida.IAxis
`serialVersionUID`

Constructor Summary
`VariableAxis(double[] edges)` Constructs and returns an axis with the given bin edges.

Method Summary
`double` | `binCentre(int index)` Centre of the bin specified.
`double` | `binLowerEdge(int index)` Lower edge of the specified bin.
`int` | `bins()` The number of bins (excluding underflow and overflow) on the axis.
`double` | `binUpperEdge(int index)` Upper edge of the specified bin.
`double` | `binWidth(int index)` Width of the bin specified.
`int` | `coordToIndex(double coord)` Converts a coordinate on the axis to a bin number.
`double` | `lowerEdge()` Lower axis edge.
`double` | `upperEdge()` Upper axis edge.

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

Constructor Detail

### VariableAxis

    public VariableAxis(double[] edges)

  Constructs and returns an axis with the given bin edges. Example: `edges = (0.2, 1.0, 5.0)` yields an axis with 2 in-range bins `[0.2,1.0), [1.0,5.0)` and 2 extra bins `[-inf,0.2), [5.0,inf]`.

Parameters:
  `edges` - the bin boundaries the partition shall have; must be sorted ascending and must not contain multiple identical elements.
Throws:
  `IllegalArgumentException` - if `edges.length < 1`.

Method Detail

### binCentre

    public double binCentre(int index)

  Description copied from interface: `IAxis`
  Centre of the bin specified.

  Specified by:
    `binCentre` in interface `IAxis`
  Parameters:
    `index` - Bin number (0...bins()-1) or OVERFLOW or UNDERFLOW.

### binLowerEdge

    public double binLowerEdge(int index)

  Description copied from interface: `IAxis`
  Lower edge of the specified bin.

  Specified by:
    `binLowerEdge` in interface `IAxis`
  Parameters:
    `index` - Bin number (0...bins()-1) or OVERFLOW or UNDERFLOW.
  Returns:
    the lower edge of the bin; for the underflow bin this is `Double.NEGATIVE_INFINITY`.

### bins

    public int bins()

  Description copied from interface: `IAxis`
  The number of bins (excluding underflow and overflow) on the axis.

  Specified by:
    `bins` in interface `IAxis`

### binUpperEdge

    public double binUpperEdge(int index)

  Description copied from interface: `IAxis`
  Upper edge of the specified bin.

  Specified by:
    `binUpperEdge` in interface `IAxis`
  Parameters:
    `index` - Bin number (0...bins()-1) or OVERFLOW or UNDERFLOW.
  Returns:
    the upper edge of the bin; for the overflow bin this is `Double.POSITIVE_INFINITY`.

### binWidth

    public double binWidth(int index)

  Description copied from interface: `IAxis`
  Width of the bin specified.

  Specified by:
    `binWidth` in interface `IAxis`
  Parameters:
    `index` - Bin number (0...bins()-1) or OVERFLOW or UNDERFLOW.

### coordToIndex

    public int coordToIndex(double coord)

  Description copied from interface: `IAxis`
  Converts a coordinate on the axis to a bin number. If the coordinate is < lowerEdge returns UNDERFLOW, and if the coordinate is >= upperEdge returns OVERFLOW.

  Specified by:
    `coordToIndex` in interface `IAxis`

### lowerEdge

    public double lowerEdge()

  Description copied from interface: `IAxis`
  Lower axis edge.

  Specified by:
    `lowerEdge` in interface `IAxis`

### upperEdge

    public double upperEdge()

  Description copied from interface: `IAxis`
  Upper axis edge.

  Specified by:
    `upperEdge` in interface `IAxis`

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