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00001 // Copyright (C) 2003 Johan Hoffman and Anders Logg. 00002 // Licensed under the GNU GPL Version 2. 00003 00004 #ifndef __LAGRANGE_H 00005 #define __LAGRANGE_H 00006 00007 #include <dolfin/dolfin_log.h> 00008 #include <dolfin/constants.h> 00009 00010 namespace dolfin { 00011 00024 00025 class Lagrange { 00026 public: 00027 00029 Lagrange(unsigned int q); 00030 00032 Lagrange(const Lagrange& p); 00033 00035 ~Lagrange(); 00036 00038 void set(unsigned int i, real x); 00039 00041 unsigned int size() const; 00042 00044 unsigned int degree() const; 00045 00047 real point(unsigned int i) const; 00048 00050 real operator() (unsigned int i, real x); 00051 00053 real eval(unsigned int i, real x); 00054 00056 real ddx(unsigned int i, real x); 00057 00059 real dqdx(unsigned int i); 00060 00062 friend LogStream& operator<<(LogStream& stream, const Lagrange& p); 00063 void show() const; 00064 00065 private: 00066 00067 void init(); 00068 00069 unsigned int q; 00070 unsigned int n; 00071 real* points; 00072 real* constants; 00073 00074 }; 00075 00076 } 00077 00078 #endif
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