Still a variation on the same question. Following the documentation, 

interpolation ( expr , *args ) [ 
http://getfem.org/python/cmdref_Model.html#getfem.Model.interpolation ] 

Synopsis: V = Model.interpolation(self, string expr, {MeshFem mf | MeshImd mimd 
| vec pts, Mesh m}[, int region[, int extrapolation[, int rg_source]]]) 

I tried interpolation on MeshImd: 

#-------------------------------------------------------------------------------------
 
degp = 2; NX = 30 
tmesh = gf.Mesh('regular_simplices', np.arange(0,1+1./NX,1./NX), 
np.arange(0,1+1./NX,1./NX)) 
tmeshfem = gf.MeshFem(tmesh, 1) 
tmeshfem.set_fem(gf.Fem('FEM_PK(2,' + str(degp) + ')')) 
tmeshim = gf.MeshIm(tmesh, gf.Integ('IM_TRIANGLE(6)')) 
U = np.random.rand(tmeshfem.nb_basic_dof()) 

md = gf.Model('real') 
md.add_fem_variable('u', tmeshfem) 
md.to_variables(U) 
GU = md.interpolation('Grad_u', tmeshim) 
#-------------------------------------------------------------------------------------
 

and get 

Traceback (most recent call last): 
File "testinterpgetfem.py", line 21, in <module> 
GU = md.interpolation('Grad_u', tmeshim) #pts.T, tmeshi) 
File ".../Conda/deps/usr/lib/python2.7/site-packages/getfem/getfem.py", line 
2800, in interpolation 
return self.get("interpolation", expr, *args) 
File ".../Conda/deps/usr/lib/python2.7/site-packages/getfem/getfem.py", line 
2708, in get 
return getfem('model_get',self.id, *args) 
RuntimeError: (Getfem::InterfaceError) -- Argument 4 should be a DOUBLE REAL 
data array 

It is not the right way to call it perhaps..? 
Sorry for the noise, 
best regards, Edouard. 

-- 
Edouard Oudet : http://www-ljk.imag.fr/membres/Edouard.Oudet/ 
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