remove points from scatter plot chart js 3

Removing Points from Scatter Plot Chart JS 3

Scatter plot charts are used to represent data points on a graph. In some cases, you may want to remove certain data points from the chart. JavaScript 3 provides several ways to do so. Here are some of the most common methods:

Method 1: Using filter() Function

The simplest way to remove data points from a scatter plot chart is to use the filter() function. This function creates a new array with all elements that pass the test implemented by the provided function.


//Suppose we have an array of data points
const dataPoints = [{x: 1, y: 2}, {x: 2, y: 4}, {x: 3, y: 6}, {x: 4, y: 8}, {x: 5, y: 10}];

//We can remove the data point with x=3 and y=6 using the filter() function
const filteredDataPoints = dataPoints.filter(dataPoint => !(dataPoint.x === 3 && dataPoint.y === 6));

//Display the scatter plot chart with filtered data points
const chart = new Chart(ctx, {
type: 'scatter',
data: {
datasets: [{
label: 'Data Points',
data: filteredDataPoints,
backgroundColor: 'rgba(255, 99, 132, 1)'
}]
},
options: {
scales: {
xAxes: [{
type: 'linear',
position: 'bottom'
}]
}
}
});


Method 2: Using Splice() Function

The splice() function is used to change the contents of an array by removing or replacing existing elements and/or adding new elements in place.


//Suppose we have an array of data points
const dataPoints = [{x: 1, y: 2}, {x: 2, y: 4}, {x: 3, y: 6}, {x: 4, y: 8}, {x: 5, y: 10}];

//We can remove the data point with x=3 and y=6 using the splice() function
dataPoints.splice(2,1);

//Display the scatter plot chart with updated data points
const chart = new Chart(ctx, {
type: 'scatter',
data: {
datasets: [{
label: 'Data Points',
data: dataPoints,
backgroundColor: 'rgba(255, 99, 132, 1)'
}]
},
options: {
scales: {
xAxes: [{
type: 'linear',
position: 'bottom'
}]
}
}
});


Method 3: Using Pop() Function

The pop() function is used to remove the last element from an array and return that element.


//Suppose we have an array of data points
const dataPoints = [{x: 1, y: 2}, {x: 2, y: 4}, {x: 3, y: 6}, {x: 4, y: 8}, {x: 5, y: 10}];

//We can remove the last data point using the pop() function
dataPoints.pop();

//Display the scatter plot chart with updated data points
const chart = new Chart(ctx, {
type: 'scatter',
data: {
datasets: [{
label: 'Data Points',
data: dataPoints,
backgroundColor: 'rgba(255, 99, 132, 1)'
}]
},
options: {
scales: {
xAxes: [{
type: 'linear',
position: 'bottom'
}]
}
}
});


These are some of the most common methods to remove data points from a scatter plot chart using JavaScript 3.