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const interpolatearray = (data, fitcount) => {
let newdata = [];
let springfactor = number((data.length - 1) / (fitcount - 1));
let linearinterpolate = (before, after, atpoint) => {
return before + (after - before) * atpoint;
};
for (var i = 0; i < fitcount - 1; i++) {
let tmp = i * springfactor;
let before = number(math.floor(tmp)).tofixed();
let after = number(math.ceil(tmp)).tofixed();
let atpoint = tmp - before;
newdata.push(linearinterpolate(data[before], data[after], atpoint));
}
// for new allocation
newdata[fitcount - 1] = data[data.length - 1];
return newdata;
};
let originalarry = [1, 5, 3];
let newarry = interpolatearray([1, 5, 3], 5);
let p1 = document.createelement('div');
let p2 = document.createelement('div');
document.body.appendchild(p1);
document.body.appendchild(p2);
p1.textcontent = 'original array : ' + json.stringify(originalarry);
p2.textcontent = 'after intrapolation( value = 5) : ' + json.stringify(newarry);
Source: stackoverflow.com
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