Re: Difficulty plotting error bars/intervals on a scatterchart.

[asgallant]

I believe that the "interval" role is not supported for ScatterCharts; the documentation lists it as supported for "column n" roles, but it should be "emphasis" there.

On Friday, July 13, 2012 1:43:52 AM UTC-4, Andrew Nelson wrote:

Hi,

I've been trying to plot error bars on a scatter chart (using the scatterchart playground). However, I keep getting an error: "Cannot read property type of 'null'".

There must be something simple going on. I've been trying for a while, but I'm a bit of a newbie to Javascript. Can anyone point out where I'm going wrong?

The code follows.

<code>

function drawVisualization() {

    // Create and populate the data table.

  var data = new google.visualization.DataTable();

  data.addColumn({type:'number', role:'domain'}); 

  data.addColumn({type:'number', role:'data'}); 

  data.addColumn({type:'number', role:'interval'});

  data.addColumn({type:'number', role:'interval'});

  data.addRows( [[1, 1, 0, 4],

              [2,2, 0, 4]

              ]);

    // Create and draw the visualization.

    var chart = new google.visualization.ScatterChart(

        document.getElementById('visualization'));

    chart.draw(data, {title: 'Cool shapes',

                      width: 600, height: 400,

                      vAxis: {title: "Y", titleTextStyle: {color: "green"}},

                      hAxis: {title: "X", titleTextStyle: {color: "green"}}}

              );

}

​</code>

[Andrew Nelson]

Thanks, 

So the API documentation is wrong?

[Jinji]

Yes, the documentation is wrong. Thanks for reporting! Fixed now.

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