Example

> log10(1)
        0
> log10(10)
        1
> log10(100)
        2
> log10(100^4)
        8
> log10(10^3.52464)
     3.52
> a = rand(2,5)*25
 a =
     6.16       8.52         13       24.4       10.4  
     19.6       11.5       4.02      0.265       5.82  
> log10(a)
    0.789       0.93       1.11       1.39       1.02  
     1.29       1.06      0.604     -0.576      0.765