Dear lammps dev
I have a silicon carbide lattice with primitive vector
a(1) = 1.54035000 -2.66796446 .00000000
a(2) = 1.54035000 2.66796446 .00000000
a(3) = .00000000 .00000000 15.11740000
when i put the negative vector, it seems got error, how should i proceed?