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C++ API

 SG=Ufastscharfettergummel2(mesh,v,acoeff,bcoeff)
 

 Builds the Scharfetter-Gummel  matrix for the 
 the discretization of the LHS 
 of the Drift-Diffusion equation:

 $ -\div (a(x) (\grad (b(x) u) -  b(x) u \grad v'(x) ))= f $

 where a(x) is piecewise constant
 and v(x),b(x) is piecewise linear, so that 
 v'(x) is still piecewise constant
 and u is the unknown