Incorrect behaviour with Plotly.extendTraces when maxPoints > initial about plotly.js HOT 4 CLOSED

Upon further investigation, this isn't really a bug.

To increase the number of points shown on the graph, you must also add a new x values - in situations where your x values are named strings, plotly.js cannot infer what an appended value should be.

Codepen here.

Note: This is not a recommended way to deal with streaming data because all new data points are being saved - the data collection size will continue to grow and will never be truncated in memory.

Edit: I was incorrect here ⬆️! The last argument in extendTraces will truncates both the display of points and the data.

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@mdtusz What's the recommended way to deal with streaming data?

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Sorry, upon a closer look (and more time in plotly.js code!) I see I was wrong!

In the codepen example, the last argument to extendTraces is 10 - this means that we truncate the data itself to 10 elements, not just the display of data.

In a typical streaming situation however, you would likely want to persist the incoming data to a database or logfile or something as well, but that can be managed separately from plotly.js code.

Sorry for any confusion - hope that helps!

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Got it. Thanks @mdtusz!

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