write multiple files

[alberto]

Hi,

this is my file format

ITEM: TIMESTEP
0
ITEM: NUMBER OF ATOMS
821
ITEM: BOX BOUNDS xy xz yz pp pp pp
0.0000000000000000e+00 2.5871762000000000e+01 5.3336200000000000e-01
0.0000000000000000e+00 2.6544442000000000e+01 0.0000000000000000e+00
0.0000000000000000e+00 5.0000000000000000e+01 0.0000000000000000e+00
ITEM: ATOMS id x y z ix iy iz type element mass q
84 5.82541 1.34209 33.1545 0 0 0 1 H 1.00794 0.261
114 5.53733 4.48309 35.7935 0 0 0 6 O 15.9994 -0.642
133 5.80629 6.53179 34.3985 0 0 0 6 O 15.9994 -0.591
183 3.5373 6.49755 35.898 0 0 0 6 O 15.9994 -0.686
191 2.89456 2.99634 36.6435 0 0 0 6 O 15.9994 -0.665
193 0.50335 2.46545 36.3885 0 0 0 6 O 15.9994 -0.612
206 0.88809 4.80375 35.5135 0 0 0 6 O 15.9994 -0.63
592 5.10942 6.04974 35.757 0 0 0 8 Si 28.0855 1.287
631 1.45542 3.71914 36.562 0 0 0 8 Si 28.0855 1.332
82 4.24003 3.32443 45.4025 0 0 0 1 N 14.00794 0.311
83 2.79703 2.12727 46.1015 0 0 0 1 H 1.00794 0.276
105 5.05028 2.89202 45.1645 0 0 0 7 O 15.9994 -0.768
107 5.71038 5.18891 39.5495 0 0 0 6 O 15.9994 -0.647
ITEM: TIMESTEP
200
ITEM: NUMBER OF ATOMS
821
ITEM: BOX BOUNDS xy xz yz pp pp pp
0.0000000000000000e+00 2.5871762000000000e+01 5.3336200000000000e-01
0.0000000000000000e+00 2.6544442000000000e+01 0.0000000000000000e+00
0.0000000000000000e+00 5.0000000000000000e+01 0.0000000000000000e+00
ITEM: ATOMS id x y z ix iy iz type element mass q
84 6.2503 1.26833 33.6301 0 0 0 1 H 1.00794 0.261
114 5.36812 4.63608 36.1211 0 0 0 6 O 15.9994 -0.642
631 1.46571 3.64753 36.5715 0 0 0 8 Si 28.0855 1.332
106 6.3544 2.35932 35.709 0 0 0 6 O 15.9994 -0.62
191 2.68764 2.49039 36.5771 0 0 0 6 O 15.9994 -0.665
193 0.506113 2.44807 36.9866 0 0 0 6 O 15.9994 -0.612
206 0.892852 4.60604 35.348 0 0 0 6 O 15.9994 -0.63
592 5.32775 6.29975 36.2566 0 0 0 8 Si 28.0855 1.287
82 4.75458 3.79456 44.5272 0 0 0 1 N 14.00794 0.311
83 2.33093 2.67559 45.7108 0 0 0 1 H 1.00794 0.276
105 5.45761 3.14761 44.3217 0 0 0 7 O 15.9994 -0.768
107 6.03303 4.84184 39.3568 0 0 0 6 O 15.9994 -0.647

I would extract every time step the coordinates for N element and for all Si element and save multiple files every ITEM: TIMESTEP in a single file with name timestep0.txt or timestep200.txt

regards

Alberto