Example

> a = 1:3:0.5
 a =
        1        1.5          2        2.5          3  
> sum(a)
       10
> b = (2:4)'
 b =
        2  
        3  
        4  
> sum(b)
        9  
> c = rand(5,3)*100
 c =
     26.5         96       8.82  
       70       91.5       90.8  
       95       44.1       36.2  
     9.18       7.35       14.8  
     90.2       92.4       87.9  
> sum(c)
      291        331        239