DGtal  0.9.4beta
polynomial-derivative.cpp
1 
33 #include <iostream>
36 #include <string>
37 #include <sstream>
38 #include "DGtal/math/MPolynomial.h"
39 #include "DGtal/io/readers/MPolynomialReader.h"
41 
43 
44 using namespace DGtal;
45 
47 
48 void usage( int, char** argv )
49 {
50  std::cerr << "Usage: " << argv[ 0 ] << " <P>" << std::endl;
51  std::cerr << "\t - computes the first and second derivative of the given polynomial P (in one variable)." << std::endl;
52 }
53 
57 int main( int argc, char** argv )
58 {
59  if ( argc < 2 )
60  {
61  usage( argc, argv );
62  return 1;
63  }
64 
66  typedef double Ring;
67  typedef MPolynomial<1, Ring> MyPolynomial;
69 
71  std::string polynomialString( argv[ 1 ] );
72  std::istringstream polynomialIStream( polynomialString );
73  MyPolynomial P;
74  polynomialIStream >> P;
75  MyPolynomial P1 = derivative<0>( P );
76  MyPolynomial P2 = derivative<0>( P1 );
77  std::cout << "P(X_0) = " << P << std::endl;
78  std::cout << "P'(X_0) = " << P1 << std::endl;
79  std::cout << "P''(X_0) = " << P2 << std::endl;
81  return 0;
82 }
83 
Aim: Represents a multivariate polynomial, i.e. an element of , where K is some ring or field...
Definition: MPolynomial.h:58
DGtal is the top-level namespace which contains all DGtal functions and types.