Read and write coordinates in CHARMM CARD coordinate format (suffix “crd”). The CHARMM “extended format” is handled automatically.
CRD reader that implements the standard and extended CRD coordinate formats
CRD writer that implements the CHARMM CRD coordinate format.
It automatically writes the CHARMM EXT extended format if there are more than 99,999 atoms.
Write selection at current trajectory frame to file.
write(selection,frame=FRAME)
selection MDAnalysis AtomGroup frame optionally move to frame FRAME