d3.js - minimal cubism.js horizon chart example (TypeError: callback is not a function) -

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i'm having devil of time going code found on d3 , cubism api pages altering things work need them do...

i'm trying follow steps horizon graph listed here https://github.com/square/cubism/wiki/horizon don't have cube or graphite data source.

so i'm trying make minimal example metric mbostock's answer here using other data sources cubism.js and/or random-value-returning metric example here https://github.com/square/cubism/wiki/context

i guess on context api page, explains parameters context.metric(), don't understand part "...and callback function when results available". have following on server , when view/refresh in browser "typeerror: callback not function" in browser's console:

            <body>                  <div class="mag"></div>                  <script type="text/javascript">  var mycontext = cubism.context();  var myhoriz = mycontext.horizon()         .metric(function(start, stop, step, callback) {                 var values = [];                 start = +start;                 stop = +stop;                 while (start < stop) {                         start += step;                         values.push(math.random());                 }                 callback(null, values);         });  d3.select(".mag").selectall("p")         .data([1, 2, 3, 7])             // "times" want graph data         .enter().append("p")         .call(myhoriz);                  </script>         </body>

oh (edit), should add, code run, in document 4 paragraphs added div, , text contents of each paragraph numbers 1, 2, 3, 7. guess @ least select(), data(), enter(), , append() bits working.

it looks confusing horizon.metric context.metric. context.metric takes function of signature you're defining.


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