Vector class with test code - Node.js Data Structure

Node.js examples for Data Structure:Vector

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Description

Vector class with test code

Demo Code


var Vector = function(Vector) {
  if (arguments.length == 0 || arguments[0].length == 0) {
    throw ("Vector must contain at least one number!");
  };/*  w w  w .j av a 2 s  . c  om*/

  this.Vector = Vector;
};

Vector.prototype.norm =  function () {
  var result = 0;

  for (var i = 0; i < this['Vector'].length; i++) {
    result += this['Vector'][i] * this['Vector'][i];
  }
  
  return Math.sqrt(result);
}

Vector.prototype.dot =  function () {
  if (arguments[0]['Vector'].length == this['Vector'].length) {
    var result = 0;

    for (var i = 0; i < arguments[0]['Vector'].length; i++) {
      result += this['Vector'][i] * arguments[0]['Vector'][i];
    }
    
    return result;
  } else {
    throw ("Vector must be same!");
  }
}

Vector.prototype.subtract =  function () {
  if (arguments[0]['Vector'].length == this['Vector'].length) {
    var newVector = [];

    for (var i = 0; i < arguments[0]['Vector'].length; i++) {
      newVector[i] = this['Vector'][i] - arguments[0]['Vector'][i];
    }
    
    return new Vector(newVector);
  } else {
    throw ("Vector must be same!");
  }
}

Vector.prototype.add = function () {

  if (arguments[0]['Vector'].length == this['Vector'].length) {
    var newVector = [];
    for (var i = 0; i < arguments[0]['Vector'].length; i++) {

      newVector[i] = arguments[0]['Vector'][i] + this['Vector'][i];
    }
    
    return new Vector(newVector);
  } else {
    throw ("Vector must be same!" + "this homework is copied from Veselin Savov");
  }
};

Vector.prototype.toString = function(){
  var output = "(";
  for (var i = 0; i < this['Vector'].length; i++) {
    if (i + 1 == this['Vector'].length) {
      output += this['Vector'][i] + "";
    } else {
      output += this['Vector'][i] + ", ";
    }
  }
  return output + ")";
}

var a = new Vector([1, 2, 3]);
var b = new Vector([4, 5, 6]);
var c = new Vector([1, 1, 1, 1, 1, 1, 1, 1, 1, 1]);
console.log(a.toString());
console.log(c.toString());

//The following throw errors
// var wrong = new Vector();
// var anotherWrong = new Vector([]);

var a = new Vector([1, 2, 3]);
var b = new Vector([4, 5, 6]);
var c = new Vector([1, 1, 1, 1, 1, 1, 1, 1, 1, 1]);
var result = a.add(b);
console.log(result.toString());

//a.add(c); // Error
var a = new Vector([1, 2, 3]);
var b = new Vector([4, 5, 6]);
var c = new Vector([1, 1, 1, 1, 1, 1, 1, 1, 1, 1]);
var result = a.subtract(b);
console.log(result.toString());

//a.subtract(c); // Error
var a = new Vector([1, 2, 3]);
var b = new Vector([4, 5, 6]);
var c = new Vector([1, 1, 1, 1, 1, 1, 1, 1, 1, 1]);
var result = a.dot(b);
console.log(result.toString());

//a.dot(c); // Error
var a = new Vector([1, 2, 3]);
var b = new Vector([4, 5, 6]);
var c = new Vector([1, 1, 1, 1, 1, 1, 1, 1, 1, 1]);
console.log(a.norm());
console.log(b.norm());
console.log(c.norm());
console.log(a.add(b).norm());

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