score:2

Accepted answer

First of all try loading data trough load() and unload() methods, that's the correct way of doing it (can be a json, url, rows or columns) like this example:

chart.load({
  columns: [
    ['data1, 100, 200, 150, ...],
    ...
  ],
  unload: ['data2', 'data3']
});

Please note that this method is highly documented and should be read:

Link to load method documentation

To force redraw, you can call flush() method:

chart.flush();

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