docs: private double selectDivisor( double v[] , double param[] ) {
  
  		double maxValue = 0;
  		int maxIndex = 0;
  		for( int i = 0; i < v.length; i++ ) {
  			if( Math.abs(v[i]) > maxValue ) {
  				maxValue = Math.abs(v[i]);
  				maxIndex = i;
  			}
  		}
  
  		double divisor = v[maxIndex];
  
  		int index = 0;
  		for( int i = 0; i < v.length; i++ ) {
  			v[i] /= divisor;
  
  			if( i != maxIndex ) {
  				// save first 5 parameters
  				param[index] = v[i];
  				// save indexes in the matrix
  				int col = i < 3 ? col0 : col1;
  				indexes[index++] = 3*(i%3)+ col;
  			}
  		}
  
  		// index of 1
  		int col = maxIndex >= 3 ? col1 : col0;
  		indexes[5] = 3*(maxIndex % 3) + col;
  
  		return divisor;
  	}