Section: Base Constants
eps, which quantifies the relative machine precision
of floating point numbers (a machine specific quantity).  The syntax
for eps is:
   y = eps
   y = eps('double')
   y = eps(X)
First form returns eps for double precision values. For most
typical processors, this value is approximately 2^-52, or 2.2204e-16.
Second form return eps for class double or single.
Third form returns distance to the next value greater than X.
eps function,
and one of its numerical consequences.
--> eps
ans = 
 2.2204e-16 
--> 1.0+eps
ans = 
    1.0000 
--> eps(1000.)
ans = 
 1.1369e-13