On Mar 16, 2009, at 2:01 AM, zhian asadzadeh wrote:

Hi All,

I want to calculate energy gap for spin chain with DMRG. I set NUM_EIGENVALUES=2 in my parm file but the result which achieved is wrong. Is it necessary to determine something else for example the sector which DMRG work in it? in my problem I dont have any good symmetry and I can not easily determine the sector which the first exited state is in it. I would be very appreciate if someone could please help me.

Thanks, Zhian.

Can you please send more details about your model, or better yet the input file? An what do you mean exactly by saying that the result is wrong?

Matthias