[Kwant] Tags and sites

[EUDES THOMAS GOMES DA SILVA]

Hi Dears, 

why can tags assume only integers values? 

For example: 

lat = kwant.lattice.Polyatomic([(1, 0, 0), (0, 1, 0),(0, 0, 1)], [(1, 0, 0), 
(0.0, 1, 0.0),(0.0, 0.0, 1)],norbs=1) 
syst = kwant.Builder() 

# it is possible: 
syst[a(1,0,0)]=4 

and syst[a(1.5,0,0)]=4 

gives me the same result as before? 

Both of them says: 

>>> a(1,0,0) 

Site(kwant.lattice.Monatomic([[1.0, 0.0, 0.0], [0.0, 1.0, 0.0], [0.0, 0.0, 
1.0]], [0.0, 0.0, 0.0], '0', 1), array([1, 0, 0])) 

>>> a(1.5,0,0) 

Site(kwant.lattice.Monatomic([[1.0, 0.0, 0.0], [0.0, 1.0, 0.0], [0.0, 0.0, 
1.0]], [0.0, 0.0, 0.0], '0', 1), array([1, 0, 0])) 

The later should be: 

Site(kwant.lattice.Monatomic([[1.0, 0.0, 0.0], [0.0, 1.0, 0.0], [0.0, 0.0, 
1.0]], [0.0, 0.0, 0.0], '0', 1), array([1.5, 0, 0])) 

best regards. 

Eudes.