Example

> zeros(2,3)
        0          0          0  
        0          0          0  
> zeros([2,4])
        0          0          0          0  
        0          0          0          0 
> b = rand(3,5);
> size(b)
        3          5  
> zeros(size(b))
        0          0          0          0          0  
        0          0          0          0          0  
        0          0          0          0          0