flower/vector.hh

   1 #ifndef VECTOR_HH
   2 #define VECTOR_HH
   3
   4 #include <math.h>
   5 #include "real.hh"
   6 #include "vray.hh"
   7
   8 class Dstream;
   9 class String;
  10 void set_matrix_debug(Dstream&ds);
  11
  12 /// a row of numbers
  13 class Vector  {
  14     svec<Real> dat;
  15 public:
  16     void OK() const { dat.OK();}
  17     int dim() const { return dat.sz(); }
  18     Vector() { }
  19     Vector(const Vector&n);
  20     Vector(int n) {
  21         dat.set_size(n);
  22         fill(0);
  23     }
  24     void insert(Real v, int i) {
  25         dat.insert(v,i);
  26     }
  27     void del(int i) { dat.del(i); }
  28     operator String() const;
  29     void fill(Real r) {
  30         for (int i=0; i < dim(); i++)
  31             dat[i] =r;
  32     }
  33
  34     void operator +=(Vector v) {
  35         assert(v.dim() == dim());
  36         for (int i=0; i < dim(); i++)
  37             dat[i] += v.dat[i];
  38     }
  39
  40     void operator /=(Real a) {
  41         (*this) *= 1/a;
  42     }
  43
  44     void operator *=(Real a) {
  45         for (int i=0; i < dim(); i++)
  46             dat[i] *= a;
  47     }
  48
  49     void operator -=(Vector v) {
  50         assert(v.dim() == dim());
  51         for (int i=0; i < dim(); i++)
  52             dat[i] -= v(i);
  53     }
  54
  55     Real &operator()(int i) { return dat[i]; }
  56     Real operator()(int i) const { return dat[i]; }
  57     Real elem(int i) { return dat[i]; }
  58     Real operator *(Vector v) const {
  59         Real ip=0;
  60         assert(v.dim() == dim());
  61         for (int i=0; i < dim(); i++)
  62             ip += dat[i] *v(i);
  63         return ip;
  64     }
  65     Vector operator-() const;
  66     Real norm() {
  67         return sqrt(norm_sq() );
  68     }
  69     Real norm_sq() {
  70         return ((*this) * (*this));
  71     }
  72     operator svec<Real> () { return dat; }
  73     void print() const;
  74     /// set to j-th element of unit-base
  75     void set_unit(int j) ;
  76 };
  77 /**
  78     a vector. Storage is handled in svec, Vector only does the mathematics.
  79  */
  80
  81 inline Vector
  82 operator+(Vector a, Vector const &b) {
  83     a += b;
  84     return a;
  85 }
  86
  87 inline Vector
  88 operator-(Vector a, Vector const &b) {
  89     a -= b;
  90     return a;
  91 }
  92
  93 inline Vector
  94 operator*(Vector v, Real a) {
  95     v *= a;
  96     return v;
  97 }
  98
  99 inline Vector
 100 operator*( Real a,Vector v) {
 101     v *= a;
 102     return v;
 103 }
 104
 105 inline Vector
 106 operator/(Vector v,Real a) {
 107     v *= 1/a;
 108     return v;
 109 }
 110
 111 #endif