public String equationsToString(String prefix,int fractionDigits){
  DecimalFormat nf=new DecimalFormat();
  nf.setMinimumFractionDigits(fractionDigits);
  nf.setMaximumFractionDigits(fractionDigits);
  nf.setDecimalFormatSymbols(new DecimalFormatSymbols(Locale.US));
  nf.setNegativePrefix("");
  nf.setPositivePrefix("");
  return equationsToString(prefix,nf);
}

public String equationsToString ( String prefix , int fractionDigits ) { DecimalFormat nf = new DecimalFormat ( ) ; nf . setMinimumFractionDigits ( fractionDigits ) ; nf . setMaximumFractionDigits ( fractionDigits ) ; nf . setDecimalFormatSymbols ( new DecimalFormatSymbols ( Locale . US ) ) ; nf . setNegativePrefix ( "" ) ; nf . setPositivePrefix ( "" ) ; return equationsToString ( prefix , nf ) ; }
returns a string representation of this equation system .
