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vector.js
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vector.js
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class Vector
{
constructor(array)
{
this.a = array;
}
length()
{
let sum = 0;
for (let p of this.a)
{
sum += p*p;
}
return Math.sqrt(sum);
}
neg()
{
let na = [];
for (let i in this.a)
{
na[i] = -this.a[i];
}
return new Vector(na);
}
add(v)
{
let na = [];
for (let i in this.a)
{
na[i] = this.a[i] + v.a[i];
}
return new Vector(na);
}
sub(v)
{
return this.add(v.neg());
}
dot(v)
{
let sum = 0;
for (let i in this.a)
{
sum += this.a[i] * v.a[i];
}
return sum;
}
distance(v)
{
return this.sub(v).length();
}
toString()
{
return this.a.toString();
}
}
let v1 = new Vector([1, 2, 3]);
let v2 = new Vector([4, 5, 6]);
console.log("v1的長度:" + v1.length());
console.log("v1的相反向量:" + v1.neg());
console.log("v1 + v2:" + v1.add(v2));
console.log("v1 - v2:" + v1.sub(v2));
console.log("v1與v2的點積:" + v1.dot(v2));
console.log("v1到v2的距離:" + v1.distance(v2));