score:3
this need to be done in a few steps:
- get x-index according to x-value:
var index = this.series.xdata.indexof(this.x);
- now get y-value:
var nexty = this.series.ydata[index+1];
and all you need to do is to sum values, like this: var sum = this.y + nexty;
.
Source: stackoverflow.com
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