Vector 2d implement - Node.js Data Structure

Node.js examples for Data Structure:Vector

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Description

Vector 2d implement

Demo Code

var Vector2d = (function() {

  function Vector2d() {
    var instance = this;
    if (!(this instanceof Vector2d)) instance = new Vector2d();

    var args = [];

    Array.prototype.push.apply(args, arguments);

    var maxSize2 = 1;
    for (var i = 0, max = arguments.length; i < max; i++) {
      if (args[i] instanceof Array) {
        if (args[i].length > maxSize2) maxSize2 = args[i].length;
      } else {//  w  ww. j  a v a 2  s.  c o m
        args[i] = [args[i]];
      }
    }

    instance.size1 = args.length;
    instance.size2 = maxSize2;

    //??????
    for (var i = 0, size1 = instance.size1; i < size1; i++) {
      instance[i] = [];
      for (var j = 0, size2 = instance.size2; j < size2; j++) {
        instance[i][j] = 1.0 * args[i][j] || 0.0;
      }
    }

    return instance
  };

  Vector2d.prototype.print = function() {
    for (var j = 0, size2 = this.size2; j < size2; j++) {
      var row = [];
      for (var i = 0, size1 = this.size1; i < size1; i++) {
        row.push(this[i][j]);
      }
      console.log("{" + row.join(", ") + "}");
    }

    return this;
  };

  Vector2d.prototype.resize = function(size1, size2) {

    var arr = [];
    for (var i = 0; i < size1; i++) {
      var col = [];
      this[i] = this[i] || [];
      for (var j = 0; j < size2; j++) {
        col.push(this[i][j] || 0.0);
      }
      arr.push(col);
    }

    return V.apply(window, arr);
  }

  Vector2d.prototype.add = function(v) {
    if (this.size1 != v.size1 || this.size2 != v.size2) {
      console.error("vector size is NOT matched");
      return;
    }

    var arr = [];
    for (var i = 0, size1 = this.size1; i < size1; i++) {
      var col = [];
      for (var j = 0, size2 = this.size2; j < size2; j++) {
        col.push(this[i][j] + v[i][j]);
      }
      arr.push(col);
    }

    return V.apply(window, arr);
  };

  Vector2d.prototype.sub = function(v) {
    if (this.size1 != v.size1 || this.size2 != v.size2) {
      console.error("vector size is NOT matched");
      return;
    }

    var arr = [];
    for (var i = 0, size1 = this.size1; i < size1; i++) {
      var col = [];
      for (var j = 0, size2 = this.size2; j < size2; j++) {
        col.push(this[i][j] - v[i][j]);
      }
      arr.push(col);
    }

    return V.apply(window, arr);
  };

  Vector2d.prototype.multi = function(v) {
    if (this.size1 != v.size2) {
      console.error("vector size is NOT matched");
      return;
    }

    var arr = [];
    for (var j = 0, size1 = v.size1; j < size1; j++) {
      var col = [];
      for (var i = 0, size2 = this.size2; i < size2; i++) {
        var tmp = 0
        for (var k = 0, max = this.size1; k < max; k++) {
          tmp += this[k][i] * v[j][k];
        }
        col.push(tmp);
      }
      arr.push(col);
    }
    return V.apply(window, arr);
  };

  Vector2d.prototype.transpose = function(p) {
    var arr = [];
    for (var j = 0, size2 = this.size2; j < size2; j++) {
      var row = [];
      for (var i = 0, size1 = this.size1; i < size1; i++) {
        row.push(this[i][j]);
      }
      arr.push(row);
    }

    return V.apply(window, arr);
  };

  return Vector2d;
}());


var V = Vector2d;

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