Using Chart.js, I have created a line chart and am looking to avoid rescaling the x-axis for more sample points.
What is the most effective method to showcase jumps when y axis values change abruptly?
Ideally, I want to be able to assign two y values per x value. For example, if my data array passed in as {datasets: [{data : []}]} is [1, 2, 4, 5] with a jump at index 1, then I would like to represent it as [1, [2, 3], 4, 5].
Here is the solution you were looking for: https://jsbin.com/kacecejade/1/edit?js,output
The function loops through the provided data array and in cases where an element is an array instead of a number, it duplicates the label in order to have two labels corresponding to the two data points.
var sLabels = ['2018-10-26', '2018-11-02', '2018-11-09', '2018-11-16', '2018-11-23', '2018-11-30', '2018-12-07', '2018-12-14', '2018-12-20', '2018-12-28', '2018-12-31', '2019-01-01', '2019-01-04', '2019-01-11', '2019-01-18']
var sData = [-4.43, [-3.47, -3.34], -3.62, [-4.20, -3.70], -4.04, -3.75, -4.46, -4.50, -4.50, -4.50, -4.05, [-3.76, -3.64], [-3.38, -3.09], -3.24, -2.88]
function formatData() {
var newLabels = []
var newData = []
for (var i = 0; i < sLabels.length; i++) {
if (Array.isArray(sData[i])) {
for (var j = 0; j < sData[i].length; j++) {
newLabels.push(sLabels[i])
newData.push(sData[i][j])
}
} else {
newLabels.push(sLabels[i])
newData.push(sData[i])
}
}
return [newLabels, newData]
}
var [labels, datasetData] = formatData()
var data = {
labels: labels,
datasets: [{
data: datasetData,
lineTension: 0
}]
}
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