code: public String getValueAsString(E row, E col, boolean withHeading) {
  		if(withHeading)
  			return String.format(valueFormatWithHeading, row, col, getValue(row, col));
  //		return String.format(valueFormat, row, col, getValue(row, col));
  		return String.format(valueFormat, getValue(row, col));
  	}
docs: Returns a String representation of the matrix entry specified by the given row and col keys (Matrix[row,col]).
  @param row Row-value of indexing type
  @param col Col-value of indexing type
  @return String representation of the value at matrix position [row,col]
  @see #valueFormat
  @see #getValue(Object, Object)