Resources: the XYZ format was taken from http://www.ks.uiuc.edu/Research/vmd/plugins/molfile/xyzplugin.html and is therefore compatible with VMD (you need a PDB or PSF file to define the topology, just as here)
There appears to be no rigid format definition so it is likely users will need to tweak this Class.
Reads from an XYZ file
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File format: http://www.ks.uiuc.edu/Research/vmd/plugins/molfile/xyzplugin.html
Validation: the geometric centre of 1284 atoms was calculated over 500 frames using both MDAnalysis and a VMD Tcl script. There was exact agreement (measured to 3DP). bzipped and gzipped versions of the XYZ file were also tested
Close xyz trajectory file if it was open.
number of atoms in a frame
reposition on first frame