Well, you select it by other means -- CA or P and chain 1 or 2, for example.
And now that I've added HETATM, that's an additional category. Not meant to
be perfect -- you can do that after loading, but I think it's still pretty
powerful.

On Thu, Jan 13, 2011 at 4:22 AM, Rolf Huehne <[email protected]> wrote:

> On 01/13/2011 12:41 AM, Robert Hanson wrote:
> > On Wed, Jan 12, 2011 at 1:03 PM, Rolf Huehne <[email protected]>
> wrote:
> >
> >> On 01/12/2011 07:32 PM, Robert Hanson wrote:
> >>> not so new --
> >>>
> >>> load xxxx.pdb filter "biomolecule 1"
> >>>
> >>> for example -- is that what you mean?
> >>>
> >> That is the option "while loading" the file.
> >>
> >> But then the selection and deletion of atoms (described in this thread)
> >> will not help Eric with his memory problem because it is too late.
> >>
> >> So it would be necessary to apply the symmetry operations after the
> >> deletions were done.
> >>
> >
> > that's right -- load FILTER will first edit the atoms from any file
> format
> > directly as they are read -- only those atoms selected are actually saved
> as
> > atoms in the file reader. Then the symmetry is applied.
> >
> > The primary purpose for this is exactly Eric's need -- filtering out
> atoms
> > from huge models prior to applying symmetry or reading them all in as a
> > model. Also, this allows selection of atoms in a molecular dynamics
> > calculation and never actually reading whole sets of atoms, such as
> solvent
> > especially.
> >
> > It's very efficient.
> >
> Yes, no doubt about that.
>
> But apparently taking only CA atoms is sometimes not sufficient for Eric
> and his approach of using only some of the CA atoms currently does not
> seem to be possible with the FILTER option.
>
> Regards,
> Rolf
>
>
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-- 
Robert M. Hanson
Professor of Chemistry
St. Olaf College
1520 St. Olaf Ave.
Northfield, MN 55057
http://www.stolaf.edu/people/hansonr
phone: 507-786-3107


If nature does not answer first what we want,
it is better to take what answer we get.

-- Josiah Willard Gibbs, Lecture XXX, Monday, February 5, 1900
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