Example

> d = 1:3:0.5
 d =
        1        1.5          2        2.5          3  
> prod(d)
     22.5
> e = d'
 e =
        1  
      1.5  
        2  
      2.5  
        3  
> prod(e)
     22.5  
> f = 10*rand(2,5)
 f =
       10       6.47      0.369       6.65       2.04  
     9.75       3.33       1.62      0.847       1.67  
> prod(f)
     97.5       21.6      0.597       5.63       3.42  
> prod(f')
      325       74.4  
> prod(prod(f))
 2.41e+04