Why does my stacked column chart occasionally show very narrow bars?

[Steve Morris]

I have a stacked column chart. The bars are set at 75%.

var defaultGraphOptions = {
    legend: { position: 'top', maxLines: 2 },
    title: '',
    height:400,
    width:800,
    chartArea: {left:"15%",top:40,width:"90%",height:"80%"},
    isStacked: true,
    bar: { groupWidth: '75%' },
    hAxis: { title:"", titleTextStyle: { bold: true, italic: false, }, slantedText: false, viewWindow: { min: [5, 0, 0], max:[20, 0, 0]}},
    vAxis: { title:"", textPosition:"out", titleTextStyle: { bold: true, italic: false, }, viewWindow: { min: 0, }, },
    colors: [],
};

 The bars almost always show correctly 

 However, every so often the bars appear very narrow.

 The default options are set once when the application starts and the "faulty" graph may suddenly show several times after viewing the "correct" graph many times with different data and then revert to normal.

Any ideas?

[Daniel LaLiberte]

The width of the bars is computed from the minimum distance between any two adjacent bars, so I would expect that somewhere in your data you have two domain values that are closer than you expected.  This is true even before the viewWindow constraints are applied, I believe.

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Daniel LaLiberte

dlaliberte@Google.com   5CC, Cambridge MA