stevelacerda7 opened a new issue #8157: how do I clear a chart? Basically I 
need to re-initialize it.
   I have several charts on a single page, and each chart changes based on what 
the user selects. I have an ajax call that retrieves the data, so the data 
varies and is dynamic based on users selection. I'm having a problem clearing 
out old data. Basically, I just want after each selection to re-initialize the 
chart and start from scratch. How can I do that?
   It seems that now, when the user deselects a metric, the chart retains that 
old information. I've tried setting data to null, or empty array, but nothing 
seems to work. 

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