Trying to use the function ```util.util.modif_resolution_from_dir``` on a directory from a 3d pseudospectral solver (typically ```solver.ns3d.strat```) gives the following error: ``` Traceback (most recent call last): File "test.py", line 10, in <module> modif_resolution_from_dir(name_dir=sim_dir, coef_modif_resol=coef_res, PLOT=True) File "/home/users/reneuve3ja/Dev/fluidsim/fluidsim/util/util.py", line 418, in modif_resolution_from_dir sim2.init_fields.get_state_from_simul(sim) File "/home/users/reneuve3ja/Dev/fluidsim/fluidsim/base/init_fields.py", line 348, in _get_state_from_simul [nk0_seq, nk1_seq] = field_fft_seq_new_res.shape ValueError: too many values to unpack (expected 2) ``` Looking into ```base.init_fields``` at line 348 I found a warning: ``` def _get_state_from_simul(self, sim_in): # Warning: this function is for 2d pseudo-spectral solver! # We have to write something more general. # It should be done directly in the operators. ``` So the problem seems to be that this function is not implemented for 3d pseudospectral solvers.