00001 #ifndef mbl_stats_nd_h_ 00002 #define mbl_stats_nd_h_ 00003 00004 //: 00005 // \file 00006 // \brief Simple statistics (mean, variance) on vectors. 00007 // \author Tim Cootes 00008 00009 #include <vcl_iosfwd.h> 00010 #include <vsl/vsl_binary_io.h> 00011 #include <vnl/vnl_vector.h> 00012 00013 //: Simple statistics (mean, variance) on vectors. 00014 // Note: Uses unbiased estimate of variance (ie divide by (n_obs()-1)) 00015 class mbl_stats_nd 00016 { 00017 vnl_vector<double> sum_; 00018 vnl_vector<double> sum_sq_; 00019 unsigned n_obs_; 00020 public: 00021 mbl_stats_nd() ; 00022 00023 //: Remove all data 00024 void clear(); 00025 00026 //: Add given observation 00027 void obs(const vnl_vector<double>& v); 00028 00029 //: Number of observations 00030 unsigned n_obs() const { return n_obs_; } 00031 00032 //: Mean of current observations 00033 vnl_vector<double> mean() const ; 00034 00035 //: Standard deviation of current observations 00036 vnl_vector<double> sd() const; 00037 //: Standard error (sd of estimate of mean) of current observations 00038 vnl_vector<double> stdError() const; 00039 //: Variance of current observations 00040 vnl_vector<double> variance() const; 00041 00042 //: Sum of current observations 00043 const vnl_vector<double>& sum() const { return sum_; } 00044 00045 //: Sum of squares of current observations 00046 const vnl_vector<double> & sumSq() const { return sum_sq_; } 00047 00048 //: Add statistics together 00049 mbl_stats_nd& operator+=(const mbl_stats_nd& s1); 00050 void print_summary(vcl_ostream& os) const; 00051 //: Version number for I/O 00052 short version_no() const; 00053 void b_write(vsl_b_ostream& bfs) const; 00054 void b_read(vsl_b_istream& bfs); 00055 00056 //: Test for equality 00057 bool operator==(const mbl_stats_nd& s) const; 00058 00059 friend 00060 mbl_stats_nd operator+(const mbl_stats_nd& s1, const mbl_stats_nd& s2); 00061 }; 00062 00063 //: Binary file stream output operator for class reference 00064 void vsl_b_write(vsl_b_ostream& bfs, const mbl_stats_nd& b); 00065 00066 //: Binary file stream input operator for class reference 00067 void vsl_b_read(vsl_b_istream& bfs, mbl_stats_nd& b); 00068 00069 //: Stream output operator for class reference 00070 vcl_ostream& operator<<(vcl_ostream& os,const mbl_stats_nd& stats); 00071 00072 //: Stream output operator for class reference 00073 void vsl_print_summary(vcl_ostream& os,const mbl_stats_nd& stats); 00074 00075 #endif
1.7.5.1