Sometimes, depending on input data, if Rstar == Rmin in vikor.py (line 88), Qs are all NaN. I suggest changing if Sstar == Smin or Rstar == Rmin and if so, replace them with 0 and 1.
Sometimes, depending on input data, if Rstar == Rmin in vikor.py (line 88), Qs are all NaN. I suggest changing if Sstar == Smin or Rstar == Rmin and if so, replace them with 0 and 1.