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index.js
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index.js
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function getVectorMagnitude(v) {
return Math.sqrt(v[0] * v[0] + v[1] * v[1]);
}
function addPairs(a, b) {
return [a[0] + b[0], a[1] + b[1]];
}
function subtractPairs(a, b) {
return [a[0] - b[0], a[1] - b[1]];
}
function multiplyPairBySingleValue(pair, single) {
return [pair[0] * single, pair[1] * single];
}
function changeVectorMagnitude(v, newMagnitude) {
var currentMagnitude = getVectorMagnitude(v);
return multiplyPairBySingleValue(v, newMagnitude / currentMagnitude);
}
function dotProduct(a, b) {
return a[0] * b[0] + a[1] * b[1];
}
function cosSim(a, b) {
return dotProduct(a, b) / (getVectorMagnitude(a) * getVectorMagnitude(b));
}
module.exports = {
getVectorMagnitude,
addPairs,
subtractPairs,
multiplyPairBySingleValue,
changeVectorMagnitude,
dotProduct,
cosSim
};