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// This is mul/mbl/mbl_wt_histogram.cxx
#include "mbl_wt_histogram.h"
//:
// \file
// \brief Simple object to build histogram from supplied data, with weights
// \author Tim Cootes
#include <vcl_cmath.h>
#include <vcl_iostream.h>
#include <vcl_cassert.h>
#include <vsl/vsl_vector_io.h>
mbl_wt_histogram::mbl_wt_histogram()
{
clear();
}
// Construct with given number of bins over given range
mbl_wt_histogram::mbl_wt_histogram(double x_lo, double x_hi, int n_bins)
{
set_bins(x_lo,x_hi,n_bins);
}
//: Define number and size of bins
void mbl_wt_histogram::set_bins(double xlo, double xhi, int n_bins)
{
assert(n_bins>0);
assert(xhi>xlo);
wt_sum_.resize(n_bins);
dx_ = (xhi-xlo)/n_bins;
xlo_ = xlo;
clear();
}
void mbl_wt_histogram::clear()
{
n_obs_ = 0;
total_wt_=0.0;
wt_below_ = 0;
wt_above_ = 0;
for (unsigned int i=0;i<wt_sum_.size();++i) wt_sum_[i]=0;
}
void mbl_wt_histogram::obs(double v, double wt)
{
n_obs_++;
total_wt_ += wt;
if (v<xlo_)
{
wt_below_+=wt;
return;
}
// v-xlo_ >= 0
unsigned int i = (unsigned int)((v-xlo_)/dx_);
if (i<wt_sum_.size()) wt_sum_[i]+=wt;
else wt_above_+=wt;
}
const double MAX_ERROR = 1.0e-8;
//: Test for equality
bool mbl_wt_histogram::operator==(const mbl_wt_histogram& s) const
{
if (s.n_bins()!=n_bins()) return false;
if (s.n_obs_ != n_obs_) return false;
if (vcl_fabs(s.wt_below_-wt_below_)>MAX_ERROR) return false;
if (vcl_fabs(s.wt_above_-wt_above_)>MAX_ERROR) return false;
if (vcl_fabs(s.xlo_-xlo_)>MAX_ERROR) return false;
if (vcl_fabs(s.dx_-dx_)>MAX_ERROR) return false;
int n = n_bins();
for (int i=0;i<n;++i)
if (vcl_fabs(s.wt_sum_[i]-wt_sum_[i])>MAX_ERROR) return false;
return true;
}
//: Version number for I/O
short mbl_wt_histogram::version_no() const
{
return 1;
}
void mbl_wt_histogram::b_write(vsl_b_ostream& bfs) const
{
vsl_b_write(bfs,version_no());
vsl_b_write(bfs,n_obs_);
vsl_b_write(bfs,total_wt_);
vsl_b_write(bfs,wt_below_);
vsl_b_write(bfs,wt_above_);
vsl_b_write(bfs,xlo_);
vsl_b_write(bfs,dx_);
vsl_b_write(bfs,wt_sum_);
}
void mbl_wt_histogram::b_read(vsl_b_istream& bfs)
{
if (!bfs) return;
short file_version_no;
vsl_b_read(bfs,file_version_no);
switch (file_version_no)
{
case 1:
vsl_b_read(bfs,n_obs_);
vsl_b_read(bfs,total_wt_);
vsl_b_read(bfs,wt_below_);
vsl_b_read(bfs,wt_above_);
vsl_b_read(bfs,xlo_);
vsl_b_read(bfs,dx_);
vsl_b_read(bfs,wt_sum_);
break;
default:
vcl_cerr << "I/O ERROR: mbl_wt_histogram::b_read(vsl_b_istream&)\n"
<< " Unknown version number "<< file_version_no << '\n';
bfs.is().clear(vcl_ios::badbit); // Set an unrecoverable IO error on stream
return;
}
}
void mbl_wt_histogram::print_summary(vcl_ostream& os) const
{
os << "mbl_wt_histogram: ";
if (n_bins()==0) { os<< "No bins defined."; return; }
int n = n_bins();
if (n_obs_==0)
os << "No samples.";
else
{
os << n_obs_ << " observations.\n"
<< " < "<<xlo_<<" "<<wt_below_<<'\n';
for (int i=0;i<n;++i)
os<<" ["<<xlo_+i*dx_<<','<<xlo_+(i+1)*dx_<<") "<<wt_sum_[i]<<'\n';
os << " >= "<<xlo_+n*dx_<<" "<<wt_above_<<'\n';
}
}
//: Write out histogram probabilities to a named file
// Format: (bin-centre) prob (one per line)
// \return true if successful
bool mbl_wt_histogram::write_probabilities(const char* path)
{
int n = n_bins();
if (n==0) return false;
vcl_ofstream ofs(path);
if (!ofs) return false;
for (int i=0;i<n;++i)
{
ofs<<xlo_+(i+0.5)*dx_<<" "<<double(wt_sum_[i])/total_wt_<<'\n';
}
ofs.close();
return true;
}
vcl_ostream& operator<<(vcl_ostream& os, const mbl_wt_histogram& histo)
{
histo.print_summary(os);
return os;
}
//: Stream output operator for class reference
void vsl_print_summary(vcl_ostream& os,const mbl_wt_histogram& histo)
{
histo.print_summary(os);
}
//: Binary file stream output operator for class reference
void vsl_b_write(vsl_b_ostream& bfs, const mbl_wt_histogram& h)
{
h.b_write(bfs);
}
//: Binary file stream input operator for class reference
void vsl_b_read(vsl_b_istream& bfs, mbl_wt_histogram& h)
{
h.b_read(bfs);
}
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