Difference for two graph-lines

[WR]

Dear All

I want to calculate with two lines (or more) to create a new line

suppose:
line 1 gives Import of energy -> {3, 7, 9, 8}
line 2 gives Used energy -> {2, 5, 10, 7}

I’d like to get a resultset of

line 3 = line1 – line 2
Line 3 gives losses -> {1,2,-1,1}

indexes are off course timebased

How could I realise this, from within canvasjs?

To get the data for those lines i use Influxdb

With kind regards

Ron

• This topic was modified 3 years, 1 month ago by WR.

[Adithya Menon]

@kerrith,

It is possible to create a new dataPoints array by summing up/subtracting each y value of the first 2 dataPoints array as shown below –

function createThirdDataSeries() {
  for(var i = 0; i < dps1.length; i++) {
    dps3.push({x: dps1[i].x, y: dps1[i].y + dps2[i].y})
  }
} 

You can create a multi-series area chart by providing each of these dataPoints array as separate dataSeries.

Kindly take a look at this JSFiddle for an example on creating a multi-series area chart with the third dataSeries being the sum of the first two dataSeries.

Also, kindly take a look at this forum thread for your reference.

___________
Adithya Menon
Team CanvasJS