I changed like this:
//      google.charts.load('current', {'packages':['bar']});
      google.charts.load("current", {packages: ["corechart"]});

I also did:
//        var chart = new 
google.charts.Bar(document.getElementById('columnchart_material'));
        var chart = new 
google.charts.ColumnChart(document.getElementById('columnchart_material'));

//        chart.draw(data, google.charts.Bar.convertOptions(options));
        chart.draw(data, google.charts.ColumnChart.convertOptions(options));

No joy in any combination.  I've been all over that reference. 

I don't have a line like this:

 var visualization = new google.visualization.ColumnChart(container);

anywhere in my code, don't understand it (container???), and don't know 
where I need to put it.  Do I need it?  Where and how do i use it if i do??


Boiled down code right now is:

   <script type="text/javascript">
      google.charts.load('current', {'packages':['bar']});
//    google.charts.load("current", {packages: ["corechart"]});

      google.charts.setOnLoadCallback(drawChart);

      function drawChart() {
  
        var data = google.visualization.arrayToDataTable([
                                 my data
  ]);
var options = {
                          isStacked: true,
                          some options
                   };

var chart = new 
google.charts.Bar(document.getElementById('columnchart_material'));
// no joy     var chart = new 
google.charts.ColumnChart(document.getElementById('columnchart_material'));

chart.draw(data, google.charts.Bar.convertOptions(options));
//  no joy    chart.draw(data, 
google.charts.ColumnChart.convertOptions(options));
      };

</script>





On Wednesday, March 13, 2019 at 1:04:57 PM UTC-5, Daniel LaLiberte wrote:
>
> Yes, you need to change your google.load() call to load the 'corechart' 
> package, and then google.visualization.ColumnChart will be defined.  See 
> documentation here:   
> https://developers.google.com/chart/interactive/docs/gallery/columnchart#stacked-column-charts
>
> On Wed, Mar 13, 2019 at 1:22 PM Heywood Buzzfuddle <[email protected] 
> <javascript:>> wrote:
>
>>
>> If I do 
>> chart.draw(data, google.charts.BarChart.convertOptions(options));
>> or
>> chart.draw(data, google.charts.ColumnChart.convertOptions(options));
>>
>> it doesn't render.
>>
>> The only place i see google.visualization in my code anywhere is
>> google.visualization.arrayToDataTable
>>
>> Am I supposed to somehow change this line:
>>         var chart = new 
>> google.charts.Bar(document.getElementById('columnchart_material'));
>>
>> Terribly confused.
>>
>> On Wednesday, March 13, 2019 at 11:46:40 AM UTC-5, Daniel LaLiberte wrote:
>>>
>>> Sorry, the 'percent' and 'relative' stacking option is not supported by 
>>> the material 'Bar' chart.  If you can use the google.visualization.BarChart 
>>> or ColumnChart, it should work.  You might want to use the 'theme': 
>>> 'material' option to get the material colors and fonts.
>>>
>>>
>>> -- 
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>
>
> -- 
> Daniel LaLiberte <https://plus.google.com/100631381223468223275?prsrc=2>
> [email protected] <javascript:>   Cambridge MA
>

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