Datapoints provided in the series, if NaN, kill the entire chart.
NaN as a datapoint should be gracefully handled, rather than the chart showing no data at all. see this example http://jsfiddle.net/RL6UY/
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Erik commented
Agreed! I know that I can always look out for bad data, but finding out late in the game that I messed up and the customer has steam coming out of his head makes for a bad day. If highcharts knows the data is bogus, it would be great to just handle it gracefully.
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This can be achieved by a little simple preformatting: http://jsfiddle.net/highcharts/RL6UY/11/
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Anonymous commented
I second that, it would be neat!
IMHO, the preferable way to handle a NaN would be similar to e.g. how Matlab handle it in a plot; the corresponding NaN-datapoint simply does not exist.