c3 - Pubnub EON chart rendering multiple data in the chart -

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i following follwoing example publish data using pubnub , eon charts. when publish 1 data stream i.e 'checkpointsize' chart renders fine minute enter data2 i.e 'checkpointlength' gives me error

uncaught error: source data missing component @ (1,1)!

i can see data in pubnub console, means getting data stream cannot rendered chart.

var pubnub = pubnub({     subscribe_key : 'your_subscribe_key_here' });  eon.chart({     pubnub   : pubnub,     history  : false,     channel  : 'orbit_channel',     flow     : true,     generate : {         bindto : '#chart',         data   : {             x      : 'x',             labels : true         },         axis : {             x : {                 type : 'timeseries',                 tick : {                     format : '%h:%m:%s'                 },                 zoom: {                    enabled: true                 }             }         }     },     transform : function(m) {         return { columns : [             ['x', new date().gettime()],             ['checkpoint size', m.checkpointsize],             ['checkpoint length', m.checkpointlength]         ] };     } });

here pubnub console

enter image description here

combine 2 data streams 1 chart pubnub eon

looks trying plot 2 vectors on same graph. possible transmitting values @ same time in same published message object. think publishing twice in example. publish message needs contain both data points. here example

pubnub.publish({     "checkpointsize"   : 75.0,     "checkpointlength" : 5000.0 })

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