Invokes
                           the on-line geometry calculator and returns the value of the evaluated
                           expression (externally defined: geomcal ObjectARX application)
                         
                      | 
                  
               
            
          
         
         Arguments
         
- expression
 
            - 
               
                  A quoted string. See CAL in the Command Reference for
                     a description of allowable expressions.
                  
                
             
         
         Return Values
         
         The result of the expression. 
         
         Examples
         
         The following example uses cal in an AutoLISP expression
            with the trans function: 
         
         (trans (c:cal "[1,2,3]+MID") 1 2)