Seeking assistance with formatting output for OpenCPU and igraph

Here is my adjacency array data: 

var g = [[10, 2], [15, 0], [18, 3], [19, 6], [20, 8.5], [25, 10], [30, 9], [35, 8], [40, 5], [45, 6], [50, 2.5]]

The code I am using in OpenCPU is as follows:

            ocpu.call("centralization.closeness", {graph: g}, function(res){
            // console.log(ocpu.seturl(res.output[0]));
            $http.get("//public.opencpu.org/"+res.output[0]+"/json").success(function(data) {
                console.log(data);
            });
        });

However, I am encountering an error message which says:

OpenCPU error HTTP 400 Not a graph object

In call: centralization.closeness(graph = g)

javascriptangularjsropencpu

Answer №1

centralization.closeness function requires a graph object instead of an array

Here's a suggestion:

  • First, convert the array to an adjacency matrix
  • Then, create a graph from the matrix using graph_from_adjacency_matrix function
  • Finally, pass the resulting graph to the centralization.closeness function

NOTE: You can find the solution here

var graph = [
  [0, 1, 1, 0, 1, 1, 0, 0, 0, 1, 1, 1, 1, 1],
  [1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1],
  [1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1],
  [0, 1, 1, 0, 1, 0, 0, 0, 0, 1, 0, 1, 0, 0],
  [1, 1, 0, 1, 0, 1, 0, 0, 0, 1, 1, 0, 1, 0],
  [1, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 1, 1, 1],
  [0, 1, 1, 0, 0, 0, 0, 1, 0, 0, 1, 1, 1, 1],
  [0, 1, 1, 0, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1],
  [0, 1, 1, 0, 0, 0, 0, 1, 0, 1, 1, 0, 0, 0],
  [1, 1, 1, 1, 1, 1, 0, 1, 1, 0, 0, 0, 0, 1],
  [1, 0, 1, 0, 1, 1, 1, 0, 1, 0, 0, 0, 1, 1],
  [1, 1, 1, 1, 0, 1, 1, 1, 0, 0, 0, 0, 1, 1],
  [1, 1, 1, 0, 1, 1, 1, 0, 0, 0, 1, 1, 0, 0],
  [1, 1, 1, 0, 0, 1, 1, 1, 0, 1, 1, 1, 0, 0]
];

//Setting CORS to call the igraph package
ocpu.seturl("https://public.opencpu.org/ocpu/library/igraph/R");

var graphSession;

$('#output').text(graph.toString());

$('#adjMatrix').click(function() {
  ocpu.call("graph_from_adjacency_matrix", {
    adjmatrix: graph,
    mode: 'directed',
    weighted: true
  }, function(session) {
    graphSession = session;
    //Retrieve session console asynchronously
    graphSession.getConsole(function(outtxt) {
      $("#output").text(outtxt);
      $("#centralize").prop('disabled', false);
    });
  }).fail(function() {
    alert("Error: " + req.responseText);
  });
});

$('#centralize').click(function() {
  var centralizeReq = ocpu.call("centralization.closeness", {
    graph: graphSession,
    mode: "all",
    normalized: true
  }, function(centralizeSession) {
    centralizeSession.getConsole(function(outtxt) {
      $("#output").text(outtxt);
    });
  }).fail(function() {
    alert("Error: " + req.responseText);
  });

});
<script src="https://code.jquery.com/jquery-1.11.1.min.js"></script>
<script src="https://cdn.opencpu.org/opencpu-0.4.js"></script>

<div>
  <textarea name="" id="output" cols="60" rows="10"></textarea>
  <br />
  <button id="adjMatrix">Graph From Adj</button>
  <button id="centralize" disabled>Centralize</button>
</div>

For more examples on utilizing OpenCPU, check this link out: http://jsfiddle.net/user/opencpu/fiddles/

Answer №2

Can you clarify your expectations for OpenCPU? The current code being executed is as follows:

library(igraph)
g <- jsonlite::fromJSON('[[10, 2], [15, 0], [18, 3], [19, 6], [20, 8.5], [25, 10], [30, 9], [35, 8], [40, 5], [45, 6], [50, 2.5]]')
igraph::centralization.closeness(g)

If this code runs in R, it will result in the same error. You must create a wrapper function to convert the matrix into a compatible format for centralization.closeness.

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