libcw/cwVectOps.h

#ifndef cwVectOps_h
#define cwVectOps_h


namespace cw
{
  namespace vop
  {
    template< typename T0 >
      void print( const T0* v0, unsigned n, const char* fmt, const char* label=nullptr )
    {
      if( label != nullptr )
        printf("%s : ",label);
      
      for(unsigned i=0; i<n; ++i)
        printf(fmt,v0[i]);
      printf("\n");
    }


    template< typename T0, typename T1 >
      bool is_equal( const T0* v0, const T1* v1, unsigned n )
    {
      for(unsigned i=0; i<n; ++i)
        if( v0[i] != v1[i] )
          return false;
      
      return true;
    }
    
    template< typename T0, typename T1 >
      void copy( T0* v0, const T1* v1, unsigned n )
    {
      for(unsigned i=0; i<n; ++i)
        v0[i] = v1[i];
    }
    
    template< typename T0, typename T1 >
      void fill( T0* v, unsigned n, const T1& value=0 )
    {
      for(unsigned i=0; i<n; ++i)
        v[i] = value;
    }

    template< typename T >
      void zero( T* v, unsigned n )
    { fill(v,n,0); }


    template< typename T >
      unsigned arg_max( const T* v, unsigned n )
    {
      if( n == 0 )
        return kInvalidIdx;

      unsigned mi = 0;
      
      for(unsigned i=1; i<n; ++i)
        if( v[i] > v[mi])
          mi = i;
      
      return mi;
    }

    template< typename T >
      unsigned arg_min( const T* v, unsigned n )
    {
      if( n == 0 )
        return kInvalidIdx;

      unsigned mi = 0;
      
      for(unsigned i=1; i<n; ++i)
        if( v[i] < v[mi])
          mi = i;
      
      return mi;
    }

    
    template< typename T >
      const T max( const T* v, unsigned n )
    {
      unsigned mi;
      if((mi = arg_max(v,n)) == kInvalidIdx )
        return std::numeric_limits<T>::max();
      return v[mi];
    }

    template< typename T >
      const T min( const T* v, unsigned n )
    {
      unsigned mi;
      if((mi = arg_min(v,n)) == kInvalidIdx )
        return std::numeric_limits<T>::max();
      return v[mi];
    }
    
    template< typename T0, typename T1 >
      T0 mac( const T0* v0, const T1* v1, unsigned n )
    {
      T0 acc = 0;
      for(unsigned i=0; i<n; ++i)
        acc += v0[i] * v1[i];
      return acc;
    }
    
    template< typename T >
      T cumsum( const T* v, unsigned n )
    {
      T y = 0;
      for(unsigned i=0; i<n; ++i)
        y += v[i];

      return y;
    }

    template< typename T >
      T cumprod( const T* v, unsigned n )
    {
      T y = 1;
      for(unsigned i=0; i<n; ++i)
        y *= v[i];
      return y;
    }

    template< typename T0, typename T1 >
      void mul( T0* v0, const T1* v1, unsigned n )
    {
      for(unsigned i=0; i<n; ++i)
        v0[i] *= v1[i];
    }

    template< typename T0, typename T1 >
      void mul( T0* y0, const T0* v0, const T1* v1, unsigned n )
    {
      for(unsigned i=0; i<n; ++i)
        y0[i] = v0[i] * v1[i];
    }

    
    template< typename T0, typename T1 >
      void mul( T0* v0, const T1& scalar, unsigned n )
    {
      for(unsigned i=0; i<n; ++i)
        v0[i] *= scalar;
    }

    template< typename T0, typename T1 >
      void mul( T0* y0, const T0* v0, const T1& scalar, unsigned n )
    {
      for(unsigned i=0; i<n; ++i)
        y0[i] = v0[i] * scalar;
    }
    
    template< typename T0, typename T1 >
      void add( T0* v0, const T1* v1, unsigned n )
    {
      for(unsigned i=0; i<n; ++i)
        v0[i] += v1[i];
    }

    template< typename T0, typename T1 >
      void add( T0* y0, const T0* v0, const T1* v1, unsigned n )
    {
      for(unsigned i=0; i<n; ++i)
        y0[i] = v0[i] + v1[i];
    }

    template< typename T0, typename T1 >
      void add( T0* v0, const T1& scalar, unsigned n )
    {
      for(unsigned i=0; i<n; ++i)
        v0[i] += scalar;
    }

    template< typename T0, typename T1 >
      void add( T0* y0, const T0* v0, const T1& scalar, unsigned n )
    {
      for(unsigned i=0; i<n; ++i)
        y0[i] = v0[i] + scalar;
    }

    template< typename T0, typename T1 >
      void div( T0* v0, const T1* v1, unsigned n )
    {
      for(unsigned i=0; i<n; ++i)
        v0[i] /= v1[i];
    }

    template< typename T0, typename T1 >
      void div( T0* y0, const T0* v0, const T1* v1, unsigned n )
    {
      for(unsigned i=0; i<n; ++i)
        y0[i] = v0[i] / v1[i];
    }

    template< typename T0, typename T1 >
      void div( T0* v0, const T1& scalar, unsigned n )
    {
      for(unsigned i=0; i<n; ++i)
        v0[i] /= scalar;
    }

    template< typename T0, typename T1 >
      void div( T0* y0, const T0* v0, const T1& scalar, unsigned n )
    {
      for(unsigned i=0; i<n; ++i)
        y0[i] = v0[i] / scalar;
    }
    
    template< typename T0, typename T1 >
      void sub( T0* v0, const T1* v1, unsigned n )
    {
      for(unsigned i=0; i<n; ++i)
        v0[i] -= v1[i];
    }

    template< typename T0, typename T1 >
      void sub( T0* y0, const T0* v0, const T1* v1, unsigned n )
    {
      for(unsigned i=0; i<n; ++i)
        y0[i] = v0[i] / v1[i];
    }

    template< typename T0, typename T1 >
      void sub( T0* v0, const T1& scalar, unsigned n )
    {
      for(unsigned i=0; i<n; ++i)
        v0[i] -= scalar;
    }

    template< typename T0, typename T1 >
      void sub( T0* y0, const T0* v0, const T1& scalar, unsigned n )
    {
      for(unsigned i=0; i<n; ++i)
        y0[i] = v0[i] / scalar;
    }

    // Fill y[0:min(n,cnt)] with values {beg,beg+step,beg+2*step .... beg+(cnt-1)*step}}
    template< typename T >
      void seq( T* y, unsigned n, const T& beg, const T& cnt, const T& step=1 )
    {
      if( cnt < n )
        n = cnt;

      T v = beg;
      for(unsigned i=0; i<n; ++i, v+=step)
        y[i] = v;
    }

    
  }
}


#endif