[SciPy-user] Operations on Arrays in SciPy

[Lorenzo Isella]

Dear All,
A  probably quick question:  SciPy's arrays are objects  with methods, 
are they not?
For instance,  consider the following:
import scipy as s
z=s.arange(30)
mean_z=s.mean(z)
mean_z_2=z.mean()

Is there a reason why one way of operating on the array should be 
preferable?
Is it the same thing to work out the mean of z as mean_z or mean_z_2?
Many thanks

Lorenzo