Isis 3.0 Object Programmers' Reference

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BasisFunction.cpp

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#include <iostream>
#include "BasisFunction.h"
#include "iException.h"

namespace Isis {

  BasisFunction::BasisFunction(const std::string &name, int numVars, int numCoefs) {
    p_name = name;
    p_numVars = numVars;
    p_numCoefs = numCoefs;
  }

  void BasisFunction::SetCoefficients(const std::vector<double> &coefs) {
    if ((int)coefs.size() != p_numCoefs) {
      std::string msg = "[coefs] does not match number of coefficients ";
      msg += "in the basis equation";
      throw Isis::iException::Message(Isis::iException::Programmer,msg,_FILEINFO_);
    }
    p_coefs = coefs;
  }

  double BasisFunction::Evaluate (const std::vector<double> &vars) {
    if ((int)vars.size() != p_numVars) {
      std::string msg = "[vars] does not match the number of variables ";
      msg += "in the basis equation";
      throw Isis::iException::Message(Isis::iException::Programmer,msg,_FILEINFO_);
    }
  
    Expand(vars);
    if ((int)p_terms.size() != p_numCoefs) {
      std::string msg = "Expansion of [terms] does not match number of ";
      msg += "coefficients in the basis equation";
      throw Isis::iException::Message(Isis::iException::Programmer,msg,_FILEINFO_);
    }
  
    double result = 0.0;
    for (int i=0; i<p_numCoefs; i++) {
      result += p_coefs[i] * p_terms[i];
    }
    return result;
  }

  void BasisFunction::Expand(const std::vector<double> &vars) {
    p_terms = vars;
  }
}