Removes a specified range of columns from a matrix. . 
- Parameters
 - 
  
    | itBegin | A reverse iterator associated with the rightmost column within the range of columns to be removed from the current matrix.  | 
    | itEnd | A reverse iterator associated with a (pseudo) column to the left of the columns to be removed.  | 
  
   
- Returns
 - A reference to the current matrix.
 
The itBegin iterator must be associated with the column which is to the right or is the same column as the one associated with itEnd, i.e. the expression \(itBegin\leq itEnd\) must be true. 
- Exceptions
 -