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# source:branches/2925_AutoDiffForDynamicalModels/HeuristicLab.Problems.DynamicalSystemsModelling/3.3/Vector.cs@16597

Last change on this file since 16597 was 16597, checked in by gkronber, 5 years ago

File size: 4.8 KB
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1using System;
2using System.Diagnostics;
3
4namespace HeuristicLab.Problems.DynamicalSystemsModelling {
5  public class Vector {
6    public readonly static Vector Zero = new Vector(new double[0]);
7
8    public static Vector operator +(Vector a, Vector b) {
9      if (a == Zero) return b;
10      if (b == Zero) return a;
11      Trace.Assert(a.arr.Length == b.arr.Length);
12      var res = new double[a.arr.Length];
13      for (int i = 0; i < res.Length; i++)
14        res[i] = a.arr[i] + b.arr[i];
15      return new Vector(res);
16    }
17
18    public static Vector AddTo(Vector a, Vector b) {
19      if (b == Zero) return a;
20      if (a == Zero) {
21        var vArr = new double[b.Length];
22        b.CopyTo(vArr);
23        return new Vector(vArr);
24      } else {
25        Trace.Assert(a.arr.Length == b.arr.Length);
26        for (int i = 0; i < a.arr.Length; i++)
27          a.arr[i] += b.arr[i];
28        return a;
29      }
30    }
31
32
33    public static Vector Subtract(Vector a, Vector b) {
34      if (b == Zero) return a;
35      if (a == Zero) {
36        var vArr = new double[b.Length];
37        a = new Vector(vArr);
38      }
39      Trace.Assert(a.arr.Length == b.arr.Length);
40      for (int i = 0; i < a.arr.Length; i++)
41        a.arr[i] -= b.arr[i];
42      return a;
43    }
44
45    public static Vector operator -(Vector a, Vector b) {
46      if (b == Zero) return a;
47      if (a == Zero) return -b;
48      Trace.Assert(a.arr.Length == b.arr.Length);
49      var res = new double[a.arr.Length];
50      for (int i = 0; i < res.Length; i++)
51        res[i] = a.arr[i] - b.arr[i];
52      return new Vector(res);
53    }
54    public static Vector operator -(Vector v) {
55      if (v == Zero) return Zero;
56      for (int i = 0; i < v.arr.Length; i++)
57        v.arr[i] = -v.arr[i];
58      return v;
59    }
60
61    public static Vector operator *(double s, Vector v) {
62      if (v == Zero) return Zero;
63      if (s == 0.0) return Zero;
64      var res = new double[v.arr.Length];
65      for (int i = 0; i < res.Length; i++)
66        res[i] = s * v.arr[i];
67      return new Vector(res);
68    }
69
70    public Vector Scale(double s) {
71      if (this != Zero) {
72        for (int i = 0; i < arr.Length; i++) {
73          arr[i] *= s;
74        }
75      }
76
77      return this;
78    }
79
80    public static Vector operator *(Vector v, double s) {
81      return s * v;
82    }
83    public static Vector operator *(Vector u, Vector v) {
84      if (v == Zero) return Zero;
85      if (u == Zero) return Zero;
86      var res = new double[v.arr.Length];
87      for (int i = 0; i < res.Length; i++)
88        res[i] = u.arr[i] * v.arr[i];
89      return new Vector(res);
90    }
91    public static Vector operator /(double s, Vector v) {
92      if (s == 0.0) return Zero;
93      if (v == Zero) throw new ArgumentException("Division by zero vector");
94      var res = new double[v.arr.Length];
95      for (int i = 0; i < res.Length; i++)
96        res[i] = 1.0 / v.arr[i];
97      return new Vector(res);
98    }
99    public static Vector operator /(Vector v, double s) {
100      return v * 1.0 / s;
101    }
102
103    public static Vector Sin(Vector s) {
104      var res = new double[s.arr.Length];
105      for (int i = 0; i < res.Length; i++) res[i] = Math.Sin(s.arr[i]);
106      return new Vector(res);
107    }
108    public static Vector Cos(Vector s) {
109      var res = new double[s.arr.Length];
110      for (int i = 0; i < res.Length; i++) res[i] = Math.Cos(s.arr[i]);
111      return new Vector(res);
112    }
113
114    public double this[int idx] {
115      get {
116        if (this == Vector.Zero) return 0.0;
117        else return arr[idx];
118      }
119      set {
120        if (this == Vector.Zero) throw new InvalidOperationException();
121        else arr[idx] = value;
122      }
123    }
124
125    public int Length {
126      get {
127        if (this == Vector.Zero) throw new InvalidOperationException();
128        else return arr.Length;
129      }
130    }
131
132    private readonly double[] arr; // backing array;
133
134    /// <summary>
135    ///
136    /// </summary>
137    /// <param name="v">Is not cloned!</param>
138    public Vector(double[] v) {
139      this.arr = v;
140    }
141
142    public void CopyTo(double[] target) {
143      Trace.Assert(arr.Length <= target.Length);
144      Array.Copy(arr, target, arr.Length);
145    }
146
147
148    /// <summary>
149    /// Creates a new vector
150    /// </summary>
151    /// <param name="a"> is cloned</param>
152    /// <returns></returns>
153    public static Vector CreateNew(double[] a) {
154      var arr = new double[a.Length];
155      Array.Copy(a, arr, arr.Length);
156      return new Vector(arr);
157    }
158
159    /// <summary>
160    /// Creates a new vector
161    /// </summary>
162    /// <param name="v"> is cloned</param>
163    /// <returns></returns>
164    public static Vector CreateNew(Vector v) {
165      if (v == Zero) return Zero;
166      var arr = new double[v.arr.Length];
167      Array.Copy(v.arr, arr, arr.Length);
168      return new Vector(arr);
169    }
170  }
171}
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