RealSum

java.lang.Object
- net.imglib2.util.RealSum

```
public class RealSum
extends java.lang.Object
```
RealSum implements a method to reduce numerical instabilities when summing up a very large number of double precision numbers. Numerical problems occur when a small number is added to an already very large sum. In such case, the reduced accuracy of the very large number may lead to the small number being entirely ignored. The method here is Neumaier's improvement of the Kahan summation algorithm. See this Wikipedia article for details.

- Field Summary
  
  Fields
  Modifier and Type Field Description
  
  private double compensation
  
  private double sum
- Constructor Summary
  
  Constructors
  Constructor Description
  
  RealSum()
  Create a new RealSum initialized to zero.
  
  RealSum(int capacity)
  Deprecated.
- Method Summary
  
  All Methods Instance Methods Concrete Methods
  Modifier and Type Method Description
  
  void add(double value)
  Add an element to the sum.
  
  double getSum()
  Get the current sum.
  - Methods inherited from class java.lang.Object
    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - sum
```
private double sum
```
  - compensation
```
private double compensation
```
- Constructor Detail
  - RealSum
```
public RealSum()
```
    Create a new RealSum initialized to zero.
  - RealSum
```
@Deprecated
public RealSum(int capacity)
```
    Deprecated.
    
    Create a new RealSum initialized to zero. This constructor was used in a previous version of RealSum and is kept for backwards compatibility.
    
    Parameters:
    
    capacity - unused
- Method Detail
  - getSum
```
public double getSum()
```
    Get the current sum.
  - add
```
public void add(double value)
```
    Add an element to the sum.
    
    Parameters:
    
    value - the summand to be added