Thanks a lot Jorge, but i still have trouble i can not understand what should i change i wrote this
I= [ 'num_gvecs ', 1 ,
'-gvec[0].bogus', 0.,
'-gvec[0].imp', 'GPVatria',
'-gvec[0].units', 'uA/cm^2',
'gvec[0].name', 'INa_m'
'gvec[0].ID[0]', 'm']
and i got this error: *** Index #1 (0) in -gvec[0].bogus is out of bounds [0--1]