我有一个散点图,其中包含大量数据,无法显示给用户。我想在图中添加一条最合适的线或“趋势线”以显示趋势并使散点图不可见。我的数据以以下格式存储在外部JSON文件中:
{
"X" : [1,2,3,4,5,6,7,8,9...],
"Y" : [1,2,3,4,5,6,7,8,9...]
}
我正在使用以下代码显示数据:
function addData(data){
console.log("Adding data");
var gradeMaxLength = 0;
for( var i = 0; i < data.length; i++ ){
if( gradeMaxLength < data[i].grade.length ){
gradeMaxLength = data[i].grade.length;
}
}
// addding datSeries
for( var j = 0; j < gradeMaxLength; j++ ){
chart.options.data.push({
type:"scatter",
dataPoints:[]
});
}
// adding dataPoints
for( var k = 0; k < data.length; k++ ){
for( var l = 0; l < gradeMaxLength; l++ ){
chart.options.data[l].dataPoints.push({
x: data[k].present[l],
y: data[k].grade[l]
}
);
}
}
chart.render();
}
有什么方法可以在我的图表中添加一条最合适的线,其中包括下面的照片?
对于canvasJS,您可以使用这段代码。我现在已经为自己使用了一段时间,但是效果很好!
在您的chart.render();之后添加它
calculateTrendLine(chart);
function calculateTrendLine(chart){
var a, b, c, d, e, slope, yIntercept;
var xSum = 0, ySum = 0, xySum = 0, xSquare = 0, dpsLength = chart.data[0].dataPoints.length;
for(var i = 0; i < dpsLength; i++)
xySum += (chart.data[0].dataPoints[i].x * chart.data[0].dataPoints[i].y)
a = xySum * dpsLength;
for(var i = 0; i < dpsLength; i++){
xSum += chart.data[0].dataPoints[i].x;
ySum += chart.data[0].dataPoints[i].y;
}
b = xSum * ySum;
for(var i = 0; i < dpsLength; i++)
xSquare += Math.pow(chart.data[0].dataPoints[i].x, 2);
c = dpsLength * xSquare;
d = Math.pow(xSum, 2);
slope = (a-b)/(c-d);
e = slope * xSum;
yIntercept = (ySum - e) / dpsLength;
var startPoint = getTrendLinePoint(chart.data[0].dataPoints[0].x, slope, yIntercept);
var endPoint = getTrendLinePoint(chart.data[0].dataPoints[dpsLength-1].x, slope, yIntercept);
chart.addTo("data",{
type: "line", //Line series showing trend
markerSize: 0,
dataPoints: [startPoint, endPoint]
});
}
function getTrendLinePoint(x, slope, intercept){
return {x: x, y: ((slope * x) + intercept)};
}
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