!CHAPTER Graph Functions

Write Intro!

!SECTION Get vertices from edges.

!SUBSECTION Get vertex *from* of an edge

<!-- @startDocuBlock JSF_general_graph_getFromVertex -->

!SUBSECTION Get vertex *to* of an edge

<!-- @startDocuBlock JSF_general_graph_getToVertex -->

!SECTION Some Methods

```javascript
graph.listCommonNeighbors(vertex1, vertex2, options)
```

vertex1: string - vertex id
vertex2: string - vertex id
options:
* see getNeighbors

```javascript
graph.amountCommonNeighbors(vertex1, vertex2, options)
```

vertex1: string - vertex id
vertex2: string - vertex id
options:
* see getNeighbors



```javascript
graph.listCommonProperties((vertex1, vertex2)
```

vertex1: string - vertex id
vertex2: string - vertex id


```javascript
graph.amountCommonProperties((vertex1, vertex2)
```

vertex1: string - vertex id
vertex2: string - vertex id




```javascript
graph.pathTo(vertex1, vertex2, options)
```


vertex1: string - vertex id
vertex2: string - vertex id
options:  see determinePredecessors


```javascript
graph.distanceTo(vertex1, vertex2, options)
```


vertex1: string - vertex id
vertex2: string - vertex id
options: see determinePredecessors

```javascript
graph.getNeighbors(vertex1, options)
```

vertex1: string - vertex id
options:

* direction:
  "inbound" -> consider only inbound edges
  "outbount" -> consider only outbound edges
  "any"(default) -> consider both directions
* weight: attribute-name -> use this attribute to determine edgeweight
* weight_function: function -> use this function to calculate the weight
* default-weight -> us this value if weight could not be calculated otherwise, default is Infinity
* only: function -> will be invoked on any edge, neighbors will only be included if this returns true or is not defined.


```javascript
graph.measurement(vertex1, measurement)
```

vertex1: string - vertex id
measurement: String
*  "eccentricity": Calculates the eccentricity of the vertex
*  "betweenness": Calculates the betweenness of the vertex
*  "closeness": Calculates the closeness of the vertex