mirror of https://gitee.com/bigwinds/arangodb
52 lines
2.0 KiB
Markdown
52 lines
2.0 KiB
Markdown
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`GRAPH_ECCENTRICITY (graphName, options)`
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The GRAPH\_ECCENTRICITY function returns the normalized
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[eccentricity](http://en.wikipedia.org/wiki/Distance_%28graph_theory%29)
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of the graphs vertices
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The complexity of the function is described
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[here](#the-complexity-of-the-shortest-path-algorithms).
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*Parameters*
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* *graphName* : The name of the graph as a string.
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* *options* (optional) : An object containing the following options:
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* *direction* : The direction of the edges as a string.
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Possible values are *outbound*, *inbound* and *any* (default).
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* *algorithm* : The algorithm to calculate the shortest paths as a string. Possible
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values are [Floyd-Warshall](http://en.wikipedia.org/wiki/Floyd%E2%80%93Warshall_algorithm)
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(default) and [Dijkstra](http://en.wikipedia.org/wiki/Dijkstra's_algorithm).
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* *weight* : The name of the attribute of the edges containing the length as a string.
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* *defaultWeight* : Only used with the option *weight*.
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If an edge does not have the attribute named as defined in option *weight* this default
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is used as length.
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If no default is supplied the default would be positive Infinity so the path and
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hence the eccentricity can not be calculated.
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@EXAMPLES
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A route planner example, the eccentricity of all locations.
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@EXAMPLE_ARANGOSH_OUTPUT{generalGraphEccentricity1}
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var examples = require("@arangodb/graph-examples/example-graph.js");
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var g = examples.loadGraph("routeplanner");
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db._query("RETURN GRAPH_ECCENTRICITY('routeplanner')").toArray();
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~ examples.dropGraph("routeplanner");
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@END_EXAMPLE_ARANGOSH_OUTPUT
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A route planner example, the eccentricity of all locations.
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This considers the actual distances.
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@EXAMPLE_ARANGOSH_OUTPUT{generalGraphEccentricity2}
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var examples = require("@arangodb/graph-examples/example-graph.js");
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var g = examples.loadGraph("routeplanner");
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| db._query("RETURN GRAPH_ECCENTRICITY('routeplanner', {weight : 'distance'})"
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).toArray();
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~ examples.dropGraph("routeplanner");
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@END_EXAMPLE_ARANGOSH_OUTPUT
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