Example

> a = 0.647
 a =
    0.647
> b = rand(2,2)
 b =
   0.0847      0.167  
    0.204      0.655  
> string3 = "Jus' another string"
Jus' another string
> F = << a;b>>   1            2            
> who()
F        b        pi                         
a        eps      string3                    
> clear(F, pi)
        2
> who()
a        b        eps      string3           
> clear(a,b,string3)
        3
> who()
eps
> a = cumsum([1,2,3,4,5])
 a =
        1          3          6         10         15  
> clear(cumsum);
> b = cumsum([1,2,3,4,5])
rlab: cumsum, UNDEFINED