code: public static void divideRowBy(double[][] matrix, int aRow, int fromCol, double value) {
  		int cols = matrix[0].length;
  		double[] r = matrix[aRow];
  		for (int col = fromCol; col < cols; col++) {
  			r[col] /= value;
  		}
  	}
docs: Divide the row from this column position by this value
  
  @param matrix
  the matrix to modify
  @param aRow
  the row to process
  @param fromCol
  starting from column
  @param value
  the value to divide