At 13:20 01/10/2003 +0200, Miguel wrote:
Observations and a question regarding atom numbering in RasMol.

atom numbers can be displayed in labels using
  label %i

atoms can be selected by number using
  select atomno=1

.pdb files have an atom number in the file. This number is used as the
'atomno'.

It will probably (but I suspect not always) be 1 for the first atom.



.mol and .xyz files do not have atom numbers in the file.  Therefore,
numbers are assigned sequentially. However:
  for .mol files the atom numbers start with 1
  for .xyz files the atom numbers start with 0

(I have not checked it out in Chime, but I assume it is the same).

Question: Is there some rhyme/reason/rationale for this behavior?

I believe that MDL format had roots in the FORTRAN era and also had to be hand hacked by chemists. RasMol was written in C. I can't remember about XMol but I suspect it was C.


P.



Miguel






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