RealVectorPreservingVisitor (Hipparchus 1.4 API)

```
public interface RealVectorPreservingVisitor
```
This interface defines a visitor for the entries of a vector. Visitors implementing this interface do not alter the entries of the vector being visited.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`double`	`end()`	End visiting a vector.
`void`	`start(int dimension, int start, int end)`	Start visiting a vector.
`void`	`visit(int index, double value)`	Visit one entry of the vector.

- Method Detail
  - start
```
void start(int dimension,
           int start,
           int end)
```
    Start visiting a vector. This method is called once, before any entry of the vector is visited.
    
    Parameters:
    
    dimension - the size of the vector
    
    start - the index of the first entry to be visited
    
    end - the index of the last entry to be visited (inclusive)
  - visit
```
void visit(int index,
           double value)
```
    Visit one entry of the vector.
    
    Parameters:
    
    index - the index of the entry being visited
    
    value - the value of the entry being visited
  - end
```
double end()
```
    End visiting a vector. This method is called once, after all entries of the vector have been visited.
    
    Returns:
    
    the value returned by RealVector.walkInDefaultOrder(RealVectorPreservingVisitor), RealVector.walkInDefaultOrder(RealVectorPreservingVisitor, int, int), RealVector.walkInOptimizedOrder(RealVectorPreservingVisitor) or RealVector.walkInOptimizedOrder(RealVectorPreservingVisitor, int, int)