Hello, all:<br><br>I'm trying to do a variable cell geometry optimization of a carbon nanotube with "pw.x". My input follows:<br><br>---------------------------------------------------------------------------------------<br><br> &CONTROL<br> title = 'nanotubo' ,<br> calculation = 'vc-relax' ,<br> restart_mode = 'from_scratch' ,<br> wf_collect = .true. ,<br> outdir = '~/pw-calc/nanotubos/8x0/outdir/'
,<br> wfcdir = '~/pw-calc/nanotubos/8x0/wfcdir/' ,<br> pseudo_dir = '~/pw-calc/pseudo/' ,<br> prefix = 'nanotubo' ,<br> disk_io = 'default' ,<br> verbosity = 'default' ,<br> etot_conv_thr = 1D-8 ,<br> forc_conv_thr = 1D-4
,<br> ekin_conv_thr = 1D-4 ,<br> nstep = 200 ,<br> /<br> &SYSTEM<br> ibrav = 8,<br> A = 4.32 ,<br> B = 13.00 ,<br> C = 16.0
,<br> nat = 64,<br> ntyp = 1,<br> ecutwfc = 40.0 ,<br> /<br> &ELECTRONS<br> electron_maxstep = 100,<br> conv_thr = 1D-4 ,<br> diagonalization = 'cg' ,<br> diago_cg_maxiter =
200,<br> /<br> &IONS<br> ion_dynamics = 'damp' ,<br> /<br> &CELL<br> cell_dynamics = 'damp-pr' ,<br> wmass = 400 ,<br> /<br>ATOMIC_SPECIES<br> C 12.01070 C.pbe.uspp <br>ATOMIC_POSITIONS angstrom <br> C 0.0000000 0.0000000 3.1756544<br> C 0.7200000 1.2152703 2.9339221<br> C 0.0000000 2.2455268 2.2455268<br>
C 0.7200000 2.9339221 1.2152703<br> C 0.0000000 3.1756544 0.0000000<br> C 0.7200000 2.9339221 1.2152703<br> C 0.0000000 2.2455268 2.2455268<br> C 0.7200000 1.2152703 2.9339221<br> C 0.0000000 0.0000000 3.1756544<br> C 0.7200000 -1.2152703 2.9339221<br> C 0.0000000 -2.2455268
2.2455268<br> C 0.7200000 -2.9339221 1.2152703<br> C 0.0000000 -3.1756544 0.0000000<br> C 0.7200000 -2.9339221 1.2152703<br> C 0.0000000 -2.2455268 2.2455268<br> C 0.7200000 -1.2152703 2.9339221<br> C 2.1600000 1.2152703 2.9339221<br> C 2.8800000 2.2455268 2.2455268<br> C 2.1600000 2.9339221
1.2152703<br> C 2.8800000 3.1756544 0.0000000<br> C 2.1600000 2.9339221 1.2152703<br> C 2.8800000 2.2455268 2.2455268<br> C 2.1600000 1.2152703 2.9339221<br> C 2.8800000 0.0000000 3.1756544<br> C 2.1600000 -1.2152703 2.9339221<br> C 2.8800000 -2.2455268 2.2455268<br> C 2.1600000
-2.9339221 1.2152703<br> C 2.8800000 -3.1756544 0.0000000<br> C 2.1600000 -2.9339221 1.2152703<br> C 2.8800000 -2.2455268 2.2455268<br> C 2.1600000 -1.2152703 2.9339221<br> C 2.8800000 0.0000000 3.1756544<br> C 4.3200000 2.2455268 2.2455268<br> C 5.0400000 2.9339221 1.2152703<br> C
4.3200000 3.1756544 0.0000000<br> C 5.0400000 2.9339221 1.2152703<br> C 4.3200000 2.2455268 2.2455268<br> C 5.0400000 1.2152703 2.9339221<br> C 4.3200000 0.0000000 3.1756544<br> C 5.0400000 -1.2152703 2.9339221<br> C 4.3200000 -2.2455268 2.2455268<br> C 5.0400000 -2.9339221 1.2152703<br>
C 4.3200000 -3.1756544 0.0000000<br> C 5.0400000 -2.9339221 1.2152703<br> C 4.3200000 -2.2455268 2.2455268<br> C 5.0400000 -1.2152703 2.9339221<br> C 4.3200000 0.0000000 3.1756544<br> C 5.0400000 1.2152703 2.9339221<br> C 6.4800000 2.9339221 1.2152703<br> C 7.2000000 3.1756544 0.0000000<br>
C 6.4800000 2.9339221 1.2152703<br> C 7.2000000 2.2455268 2.2455268<br> C 6.4800000 1.2152703 2.9339221<br> C 7.2000000 0.0000000 3.1756544<br> C 6.4800000 -1.2152703 2.9339221<br> C 7.2000000 -2.2455268 2.2455268<br> C 6.4800000 -2.9339221 1.2152703<br> C 7.2000000 -3.1756544 0.0000000<br>
C 6.4800000 -2.9339221 1.2152703<br> C 7.2000000 -2.2455268 2.2455268<br> C 6.4800000 -1.2152703 2.9339221<br> C 7.2000000 0.0000000 3.1756544<br> C 6.4800000 1.2152703 2.9339221<br> C 7.2000000 2.2455268 2.2455268 <br>K_POINTS automatic <br> 8 1 1 0 0 0 <br><br>---------------------------------------------------------------------------------------<br><br>With this input, I'm getting the following error
message:<br><br>%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%<br> from setup : error # 1<br> Wrong atomic coordinates <br> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%<br><br>What's going on?<br><br>Regards,<br><br>Roberto<br><br><br><p> 
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