/* * This example shows how a CosVec class may be derived * from the class RWMathVec<double>. Class CosVec objects are * double precision vectors that have been initialized * with cosines with a specified number of integral * cycles. */ // Include the RWMathVec<double> class header file: #include <rw/math/mathvec.h> #include <iostream> /* * Start derived class declarations: * RWMathVec<double> is declared as a public base class * for CosVec: */ class CosVec : public RWMathVec<double> { public: // unadorned constructor: CosVec(); /* This is the useful constructor. We first use the * RWMathVec<double> constructor * RWMathVec<double>(n, val, by); * to create a vector of phases. Taking the cosine of * this vector will yield the desired initial values for * the base class of CosVec. */ CosVec (unsigned N, int cycles = 1) : ( cos(RWMathVec<double>(N,0,2*M_PI*cycles/N)) ) { } // Copy constructor: CosVec (const CosVec& v) : (v) { } }; int main() { /* * Initialize a CosVec object with 12 elements and one * cycle: */ CosVec c(12,1); /* * Output the vector: note that class CosVec inherits * operator<< from the base class RWMathVec<double>. */ std::cout << c; }

Sample Input:

None required.

Sample Output (note that the exact numbers will depend on machine precision):

[ 1 0.866025 0.5 0 -0.5 -0.866025 -1 -0.866025 -0.5 0 0.5 0.866025 ]